I think the core of it is here and in the linked blog post by the original author of Mastodon:
https://github.com/mastodon/mastodon/issues/309#issuecomment-469260847
@tjcrowdertech thanks TJ, this is helpful!
I just remain agnostic to whether this is just a subjective hypothesis vs a provable phenomenon (the one by which quoting content is a net negative). While I respect the opinion and more importantly the hard work behind it, and also understand “better safe than sorry”, I still think the UX is worse without it and it’s a barrier to adoption.