We received some push back for Stacks 1.0 as well! And for similar reasons i.e., you don't want to put a lot of additional data into the Bitcoin blockchain (makes it much harder to scale Bitcoin that way).

This was the primary reason why for Stacks 2.0, a hard design requirement was to make absolutely no changes to Bitcoin and to not put additional data in Bitcoin.

With Stacks thousands of STX transactions result in a single hash on Bitcoin (technically on the order of active miners on Bitcoin), so Stacks transactions automatically settle on Bitcoin every block.