Here is a poll about expected behaviours on Mastodon:
Should original toots that begin with a @ (mention) be treated similar to an original toot (regardless of @) (current behaviour) or similar to a reply to another toot (e.g. not shown to your followers who do not also follow the person you're @'ing) (Twitter behaviour)
@gargron
I did the current behavior intentionally because it was an issue many on the local timeline were following... could have been more subtle and dm'd the individual I originally @'d and asked them to update the local, but didn't think of that in the moment...