Not just stylistic choices - I absolutely love the way ex. gitlab lets you do a suggested change in a comment, precisely because it lets me do all the work and the MR owner just has to click to accept if they agree. That lowers the bar for what I'm willing to bring up in the first place (though I personally still don't like to comment on matters of style or taste) while making it less work for everyone, which makes it much easier to give useful suggestions:)
I'm not sure about gitlab, but on github this is a distinct feature where you post a comment wrapped in three backticks and the language as suggestion. It'll format it as a diff that the author can one-click create a commit from.
Services like GitHub and GitLab support preventing changes that overwrite a repo's history, in addition to tracking history even when you force update a branch.
You can revert and even force-update the branch to rewrite it's history, but GitHub still tracks the old commits and even lists in the PR the events that rewrote the branch history.
