> I can still install Excel 97 if I want to
That's the survivor bias. There's plenty of things that you can no longer install and the things you can still install, it's mostly because there's someone that maintains their API and whatnot (thus, the company hasn't gone out of business or haven't decided not to maintains it). Look at games, GOG has an R&D department to make sure you can run the games on their platform.
I'm pretty sure there's a ton of people here that can talk about some old computer or VM that they have to keep up because of old legacy stuff.
> I mean, there is perceptible lag in character entry that never used to happen. Sure, my computer used to freeze inexplicably, but Atom crashes often enough that I don't consider that a win, and text has a noticeable delay before it appears on the screen when using Atom. Text entry is something I can implement flawlessly on a microcontroller and the majority of applications I use on a daily basis get it wrong.
Who forced you to use Atom? That's your decision to use something still heavily in development using some new technologies (not meant to be faster or more stable, just easier to develop into). It's like buying a bicycle and complaining it doesn't go as fast as the car you had before.