One of the advantages of this was that you could hide a key somewhere (a common thing to do was to put it in a magnetic box and attach it to the car's underside) that would let you get in if you locked yourself out but would not unlock the ignition switch, so even if someone else found that key, they wouldn't be able to start the engine and steal the car.

How about outside hood releases? 

Pretty much all cars had these until that began to change in the '80s – which was around the time what had been a high trust society began to become less so. In the high-trust times, cars had outside hood releases because you generally didn't have to worry about someone popping your hood and messing with the engine. Or stealing your battery. Most new and late-model vehicles have dual-releases, too. There's the main one – inside the vehicle – that you pull first, which "pops" the hood enough that you can reach under the lip and manually release the catch that lets you raise the hood.

Hand cranks to lower and raise the side glass –

These used to be as common as power window switches are now, because power windows were once considered a luxury feature and they were usually optional in most cars. The last new vehicles that even offered with manual roll-up/down window cranks were the Jeep Wrangler JL and Gladiator, through the end of 2024. Power windows are, of course, a convenience. But they are also an expense. The making standard of previously luxury features (other examples of this include AC) is why almost all new cars are luxury-priced cars.