PWAs were not liked when they came out.
By some ppl. There were also ppl who did like them. As soon as the desktop support was axed, fans of the feature started complaining immediately.
at the time, people in general did not like PWAs as a concept. Independent of the browser
Again, I think this is a sampling issue, because my experience was the complete opposite.
And one of the key parts of PWA features was the "Progressive" part. The site works without those features and you don't have to use them so removing the support never made much sense to me.
Doing an AMA on mastodon would be a horrible experience for everyone. Others have pointed out the obvious difference in reach, blocks/defederation means some ppl may not even be able to participate, participants might never receive questions, users from different instances wouldn't be able to see sibling comments, etc.