You can ask, you can see comparisons online, you can say "this Rotation got me Xdps, this one got me Y dps"

You can see where your drops are, there is alot to be gained with the info.

But parses would be up to you to share, therfore less likely a harassment issue.
If your dps is low your fc can help you, but as it is nobody knows shit about if any changes they make matters unless you're on pc