Natively supporting an Android app store allows them to get apps so users will want to buy the hardware, which in turn generates market share that gets developers interested.
Around here when people aren't carrying an iPad, they are most certainly carrying either a Surface or a foldable Windows laptop.
Note that there are quite a few commercial "Android on PC" emulators already, e.g. https://www.memuplay.com/, https://www.bluestacks.com/ and https://www.bignox.com/.
In terms of scale, Bluestacks claim they have 50 million monthly active users which makes them pretty substantial! From https://www.bluestacks.com/promote-your-game.html. Overall mobile gaming revenue is now larger than console gaming and more than 2x PC gaming, and rapidly growing (https://scaletech.medium.com/mobile-gaming-statistics-trends...). Android gaming is a much bigger market than you'd imagine, especially for the younger generation.
> hard to see how it competes with the median user getting an iPhone
> This is the case with the consumer in China, where ... the iPhone is still preferred by those who can afford it
I think you're seriously overestimating how popular iPhones are, even to users who can afford them. Especially if you're looking at Windows users, Android is hugely dominant outside the US.
In China for example, iOS market share is actually constant around 20% or maybe slightly declining over the last decade (https://www.statista.com/statistics/262176/market-share-held...) despite the huge increase in average purchasing power, which makes it seem unlikely that the only thing holding people in China back from them is the price.
Globally, Android is at 70% of devices (https://gs.statcounter.com/os-market-share/mobile/worldwide) even in relatively wealth areas like the EU. iOS is primarily popular in the USA (where it's about 60% of devices). I suspect iOS and Mac usage are fairly closely correlated, so the Android percentage goes up substantially if you're only looking at Windows users. I think Android integration actually makes a lot of sense for Microsoft!
It subjects me to ads for third-rate games that I can't imagine people play. First-tier Android games like F/GO and Genshin Impact seem to be disabled on non-phone devices, particularly Bluestacks and Android TV. I see a huge amount of fan art from those games, but I wonder if gaming on Bluestacks is just a Potemkin Village.
So a user count comparable to 100%+ of the US phone user population?
It is not a small market, there's (I assume) a good correlation with Windows users, and it's not a bad idea for Microsoft to be looking at potential integrations here.
I think a possible advantage is also integration with Teams and OneDrive. Aandroid apps don't tend to use file stored in directory structures. You use the share menu instead and maybe some pickers for photos and downloads. This could integrate well into their cloud ecosystem. Save app data to OneDrive and have sharing menus work between the two. You could even have tabs in teams that show an Android app and store the data in the team. Corporate IT departments might prefer that to voluminous directory structures and vendor management.
“Clubhouse for Android” category: avant- grade apps that launch first on Android or define android platform. Nonexistent.
“Median phone user ecosystem:” The TikTok Facebook, Instagram, WhatsApp, YouTube, Snapchat, China app ecosystem and India app ecosystem. The experience of all these is bad on Windows browsers or unavailable.
”Games”: hard to say, because Windows is a better platform for games than Android by 10x.
This doesn’t sound very strategy driven. If it’s UX driven, hard to see how it competes with the median user getting an iPhone. This is the case with the consumer in China, where despite 30 Android app stores and lots of innovation / competition the iPhone is still preferred by those who can afford it.