Automotive ignitions barring a few stupid setups in the 90s like the Jeep XJ (which was laughably easy to steal, but it was Chrysler and AMC so you can just expect certain levels of incompetence and shit design) have been much more than just a simple cut key. Going back to even the 80s, GM had a mostly excellent simple theft deterrent in the keys (a special resistor whose value the ECM knew, called passkeys) that made it harder than just brute forcing the ignition cylinder. It honestly made stealing someone's thirdgen or corvette a lot harder. Keys with things like fobs have evolved since and on a car with a real key made since the vast majority of this sites userbase was probably born is going to take some real specific smarts and work if you need both a physical key and whatever additional security the manufacturer has cooked into the fob. You really need an immobilizer system that requires both a transponder and a correct cut key for the security on the car to be decent.

Tumblers can be trivially bypassed or broken. The only thing providing real security in your examples are the transponders. The cut keys are worthless.

If you get rid of the transponder, it has weak security. If you get rid of the cut key, you have pretty much the same security.