Personal computers are probably the only reference point in favor of “install anything you want”. Walkmans, TVs, game consoles, MP3 players, household appliances, automobiles, flip phones etc all come without the ability to run custom software. I think the only reason PCs didn’t start with an App Store model is that they predate the internet, so there was no way for them to really control distribution.

Frankly I think there’s a reason why no more open model is succeeding — the demand is not there and the app stores provide the utility most people want. I used to jailbreak my iPhone but there’s really no need anymore.