It does that when it's the default, too. I only occasionally use Windows, so couldn't be bothered to install something else. Yet, I feel that every other time I start it, I'm presented with some "use edge! it's so cool!" screen I have to sit through. It also insists on changing the search engine to bing. I'm usually pretty cautious and try not to press "ok" just so it leaves me alone, yet it managed to change it. For my needs, pretty much every search engine is good enough. I prefer google since I can convince it to use dark mode and use English instead of my local language (even though windows is set to use English as its display language).

Because I accept both things on their own, and I accept that the combination of them follows naturally. Then I must (reluctantly) accept unfortunate outcome of the combination.

I wouldn't say it's reasonable that browsers could never suggest they be made default, and I don't think it's reasonable that you can't have some OS function that wants to show e.g. a help section use the OS embedded browser.