Basically, Mastodon is doing what politicians do. The reality is that no one can prevent someone from quoting you. Heck, they could just take a screenshot of your post and post that on X if they wanted. But since some people want the impossible done, they are promised something that looks like it solves the problem, but doesn't actually solve the problem. Because the problem can't be solved. People can and always will be able to quote you.

Over time, that does give new platforms an advantage though. If the older platforms refuse to adopt new innovations, the new platforms will become more attractive and gain users.

It depends if you present the fediverse server as a forum community or a social media app. If you present it as a community with a specific theme, then it depends on which audience you are trying to attract.