Because one is the official storefront and one isn't, it's a 3rd party launcher.

Heroic is neat, I've used it, but it still has those quirks, extra set up time, configuration, and complexity that something like Steam simply doesn't.

I install Steam to buy/play Steam games. I click install, it just installs. It doesn't ask me to jump through hoops to get anticheat working, I don't need to set custom wine prefixes or do anything daft with install scripts, it just plays, and my cloud saves work flawlessly with zero additional effort.

I'd be a lot more sympathetic towards Gog if they hadn't told us on multiple occasions they were going to bring their storefront to Linux, only to not do it and ignore community questions regarding it.

I don't really see how it's overblown, either. My complaint is that Gog Galaxy doesn't support Linux, and it doesn't. I'm just stating things as they are.

Clearly you don't mind the extra legwork/tinkering (nothing wrong with that btw, tinkering is cool), but I do. I work, I have kids, my time is very limited. I've went from being an avid tinkerer on my PC to someone who can't stand it when my PC doesn't 'just work' in the simplest, fastest, barrier-free way possible.

I have like 40 games on Gog, but I don't buy from there anymore. I want to just play games on my PC/TV PC/Steam Deck without having to spend a while configuring everything, and that currently isn't possible through Gog.

Does Heroic support cloud saves like Steam and GoG Galaxy? I have a laptop that I use on trips and don't really want to have to start over or figure out where they have their saves.