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And all of that ~5% are going to be graphic designers, video editors, etc. With the occasional executive who insists on using a mac because it's all they know at home.

statcounter.com lists MacOS as 15% of global desktop market share [1]. It's a bit more in some markets (25% in NA) and a bit less in others (5% in South America), and anecdotally dominant in some niches (US Startups, EU designers, etc). But I think your point stands that Windows is the overwhelming majority of the market, MacOS a distant second and everyone else barely notable (ChromeOS ranks above Linux).

1: https://gs.statcounter.com/os-market-share/desktop/worldwide

15% of billions is a lot. While the exact number of desktops is likely unknown, its safe to assume MacOS has several hundred million users. I'd suggest that as serious.

But it merely reflects my point that there tends to be one big player in most markets. Android / ios is also skewed (globally) but ios is very much a player.

You don't have to be number 1 to be in the game, but past number 2 it's very hard to break in. And if number 2 is strong, close to impossible.

it'S serious in terms of usability and support