The market for general purpose computing is Mac. Native apps are still superior to any web based solution and there's a healthy market of consumers who prefer paying for a better computing experience. You basically have three main categories of computer users today:
1. Corporate users on Windows, because the computer salesman bribed the person responsible for purchases at corporate to buy PCs with Windows. These users don't want to even touch a computer when they're not at work. Rather they'll use their phones or maybe an iPad for personal computing.
2. Gamers on Windows, because they didn't want to buy a gaming console (such as the Steam Deck).
3. Mac users. You see them everywhere in coffee shops. They're usually self employed or working remotely.
The other category of users are so small as to be marginal.
You write that you can only think of games, some productivity software and legacy enterprise software as the reason for why your OS would matter. That sounds like you're a Linux user? Linux users have been starved of having quality software for so long, that they've grown accustomed to using web services, even though these are second rate. Anybody else I've met wants to use native apps.
In my perspective, it doesn't make sense that somebody would use a web application for things such as e-mail or calendars or RSS. Why torture yourself with a bad experience, when you can use state of the art native apps for almost anything on MacOS?