It's hard to pick just one reason, but off the top of my head:

* Any failure tends to turn flying things into unguided missiles

* Noise is extremely hard to control -- I did an FAA helicopter discovery lesson, and oof

* Cities tend to have difficult to manage wind currents and hit-or-miss visibility. I was in a skyscraper across from one hit by a helicopter trying and failing to land in 2019 -- there's reasons for city no-fly zones

* Limited landing sites makes them highly situational in the first place, unless you want your streets to be helipads, which you don't

These are all fairly intrinsic and not mitigable. I can think of more issues more in the sticks, but you get the idea.

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tyre 7 hours ago | parent | next [-]

The wind in NYC is no joke. In brooklyn yesterday there were gusts so strong that car alarms were going off. In some apartment buildings, the handicap-accessible automatic doors simply cannot open into the wind.

Imagine being in a flying car. Nope nope nope!

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pastel8739 6 hours ago | parent | prev | next [-]

One more reason is that it cannot actually solve the traffic problem that it claims to solve. It might be able to solve it for rich people when they are the only ones that can afford to travel by air, but if the cost ever comes down low enough for the masses to afford it, I don’t see any reason that congestion wouldn’t be as bad or worse than it is now. And to me it’s not a good investment to improve things just for rich people.

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leoc 5 hours ago | parent [-]

There’s just a lot more space when you can move in three dimensions, so I don’t think the congestion limitations of non-flying cars are likely to be replicated. IIUC (I’m no expert) that’s one of the most attractive features of flying VTOL vehicles.

	▲	i80and 5 hours ago \| parent \| next [-]
		You're bandwidth-limited on a sparse serialized landing site map no matter what, and you need far higher distance margins that will eat up basically all of the dimensional advantages. If ground vehicles side-swipe, it's just an insurance claim. If flying vehicles sideswipe, it's a Problem(tm).
	▲	pastel8739 2 hours ago \| parent \| prev [-]
		I honestly think the most attractive features of VTOL vehicles are that they are from sci fi, and you can look up and see a bunch of empty space and wish you were there while sitting in traffic.

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jstummbillig 6 hours ago | parent | prev [-]

I am (usually) not willing to assume that the founders of highly technical startups would not consider something that I as an outsider would in the first 5 minutes of engaging with the topic.

That makes me skeptical of all of these (minus the wind currents in cities, that might have taken a little longer).

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i80and 5 hours ago | parent | next [-]

If a startup were able to truly solve the first two issues alone, they would not be burning those world-changing engineering solutions on flying taxis.

I don't know if a silent, fail-safe, and efficient method of flight is physically impossible or not, but I do know this is low on the list of applications it would be first seen in.

EDIT: I'm looking at the air taxi companies this thread started with, and no, they have not solved any of the relevant problems.

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sverhagen 6 hours ago | parent | prev | next [-]

Founders can be chasing a dream and in doing so mesmerize investors. Or they capitalize on that same dream being the investor's. Even if it's not viable, it can still be really fun company to work for and/or earn money at. Even if there is a small lane for that sort of flying machine, the sheer number of companies purportedly working on something like that is suspect. Given the huge costs for development and certification, and the small number of vehicles that will really get deployed (certainly for the first so many years), there must be many that are never going to make their money back. I worked for a drone-adjacent company and now my LinkedIn is swamped with these startups.

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RodgerTheGreat 6 hours ago | parent | prev [-]

Theranos was famously founded on pitches about blood testing from finger pricks that literally any phlebotomist and many people with a modest life science background could've told you were physically and statistically impossible on their face. You should be considerably less credulous toward startup grifters.

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jstummbillig 6 hours ago | parent [-]

The reason why you (and everyone else) knows about Theranos is that it was unique, which serves as a bad signifier if you want to judge what is likely to happen with the next startup. Being in prison and losing billions of dollars is just not something most people get excited about.

	▲	cbzbc 6 hours ago \| parent [-]
		The reason we know about Theranos is that it ended up in court. Plenty of other startups have had obviously impractical ideas that didn't go anywhere.