I think this is the only meaningful point being made in this thread.

The sound from a phone speaker is annoying, more so, than a typical in person talking. To me the solution lies somewhere in fixing that to make it sound more natural.

Everyone else claiming that some how having “loud” conversation is rude, feels like they’ve fallen into some anti-social hole… we are literally the only animal to have developed complex spoken language… it’s part of our humanity.

It’s all context. Some cultures are loud, some are quiet; some people are loud, some are quiet; some places are supposed to be loud, and so on.

The people being quiet in an normally-loud place create no problems. The people being loud in a normally-quiet place are causing problems for others by violating the quiet.

Loud people also tend to be oblivious to this and then get defensive when it’s pointed out. Not always - I’ve known some naturally-loud people who had figured out that being shushed meant they were in the wrong.

No, the loudness is a whole separate dimension. 99% of the time, there's no need to be loud in public. Not when you're talking on the phone (the microphones on a phone work great!), not when you're having a conversation with one or two other people close to you. Not when talking to Siri (etc). You can talk quietly in a place that isn't very loud, and in a place like an airport you can talk just loud enough to be clearly heard -- there's no need to shout or to project your voice.

There are exceptions to this -- of course nobody expects you to worry about your volume at a concert between sets, at a sporting event, etc. But people who speak very loudly everywhere are annoying to everyone around them.