Tourists are often buying paper tickets. There's no way for a foreign Android phone to use a digital Suica, so people with Android are stuck with a physical card or paper tickets, and there's a lot of outdated information online that the physical cards are in low supply (They were last year but this year they're not).
Is this an Android thing? My US iOS works fine with digital Suica.
When we visited Tokyo last year, what stopped us from even trying was the online information we came across was unclear and suggested we could only get the physical cards at the airport and at some tourist office, and we forgot to look for it at the airport... I don't know if that is correct or not, but compare Oyster in London which is advertised at practically every corner store, so even if you get into town not knowing the system, it's hard not to find somewhere you can get a card (or you can just use contactless - I haven't had an oyster card in years).
The UK is completely chaotic ticket-wise on a national level, though.