Respectfully, so what? There have always be specific use cases and user bases requiring a specific OS. No one ever considered OpenBSD interchangeable with Windows, few see Linux distros as a 100% drop in replacement for someone relying on Logic Pro.

Thing is, I really don't get this knee jerk "but what about INSERT_RARE_EDGECASE". It isn't helpful and argues something no one actually working on these projects ever proposed. Even if MSFT software remains in use, any gained alternative is a win, license costs and strategic autonomy both being valuable.

And yes, as you hinted, a large contingent of clerical work may already happen in a browser, with any found exceptions potentially addressable in the coming years, especially as older implementation may be updated anyways.

Let's be honest, we all underestimate how much we (can) do solely inside the browser anyways and even more so severely misgauge how few people are reliant on any native (none Electron) software at all outside gaming.

Power user is such a nebulous term anyway. To me, someone spending hours on end in Confluence can be a power user, having never left the browser. The same for a designer using Figma. Course, if one truly requires native only software, they may more likely fall under the umbrella power user, but again, few are seriously discussing just forcing those over since, reasonably, one must presume they have a reason for doing what they are doing.