> We were so close to having literal plain Linux phones. Sad to me. I wonder where this could have gone without Microsoft.

Sadly, I strong suspect it would have gone nowhere. Apps became the name of the game and iOS and Android built up strong app libraries quickly. If Microsoft failed to compete I don't think a Nokia Linux phone would have stood a chance at all. Maybe if it added Android compatibility but that would be as much of an admission of failure as anything.