I want viable alternatives too. But Microsoft's stuff accounts for a million+ edge cases that you don't really encounter until you're neck deep into whatever you're working on.
For the sake of conversation, though, there's SoftMaker Office:
But they're a subscription too. You save only $20 a year for less features than Office 365 as well (especially the lack of an email program). For most people, that savings and "no Microsoft" isn't enough.
Not that I want to encourage people to keep using Microsoft products.