Sorry, I fail to see, how a product that was developed from 2002 until 2017 proves that you lived through the 90's.

Tamagotchi

eMule was first released in 2002, as an open source alternative client to the official eDonkey2000 client.

Napster would have technically been a 90's term, since it released mid 1999, but p2p wasn't really a mainstream thing until the early 2000's.

I'll start my extensive poop tablet research as soon as my grant has been funded.

Like I said, this isn't about personal preference, this is about general preference.

You can't tell me that "people with different eyesight, and who inexplicably don't want to use Android user profiles, sharing a poop tablet" is a larger subset of users than those who just want (and reasonably expect) the damn font size to stay the same when they switch Lemmy accounts. Right now, the app exclusively caters to the first group and doesn't even give the second group an option.

Now do that for 10 different Lemmy instances every single time you choose to change a setting ...

But I can say that our "bathroom tablet" that we can all grab as needed that has the fonts for my account set bigger, my kid's smaller, etc, it's handy.

Ignoring the fact that the "communal poop tablet" is probably not all the terribly common, why on earth would you rely on In-App-User-Profiles for that instead of Android User Profiles?

but having import/export as an option that will let you set up each account exactly the same if you want,

That might have been fine with one or two Reddit alt-accounts, but Lemmy is an entirely different beast. I feel like I'm instance-hopping almost daily for one reason or another and I'm rapidly amassing new accounts. Given how aggressively some instances defederate (I'm looking at you, Beehaw), there's little choice if you want to experience most of what Lemmy has to offer.

Suddenly, keeping all settings on these accounts in sync becomes a rather tedious and arduous task, which requires repetition every time one chooses to change their settings.

Compared to that, the edge cases where it may actually be useful behavior are ridiculously small. So, having this as the default and only behavior is simply bad design.

That's pretty cumbersome, isn't it, though?

Sensible per account settings certainly are. But these almost exclusively aren't, because they aren't really account-related settings.

My eyesight certainly doesn't change when I switch Lemmy accounts/instances, so why the heck should the font size?

Even if there were a genuine use-case for having different font sizes, themes, media-handling per account/instance, do you genuinely think that the vast majority of all users want entirely different app settings per Lemmy account and have them revert to their defaults each time they log into a new account, or would the majority just want to set these things up once and have them apply to all accounts automatically?

Per account settings, they way they are done here, would be a terrible default. As it stands, though, that's not just the default, it appears to be the only option.

I generally agree with you, and Microsoft has always been notoriously awful at naming just about anything. The still are.

But Cortana's reputation has been ruined to the point where there's no coming back from it. It was a good name, but a lousy product. From a marketing perspective, it's far, far, easier to start from scratch with a better product than to try to repair the reputation of the old one.