Saying not to bother with the favourite button on mastodon because it doesn't affect any algorithm is like saying not to say thank you to someone because no one else will hear.

Stop thinking in those old social media ways of engagement and visibility and algorithms and reach and audience and start thinking about being social.

And BOOST! It's how you saw this, probably!

A favourite is a nice thanks, a boost lets everyone else discover the great thing you discovered too!