If you enjoy someone's post on #Mastodon go ahead and click the star. If someone tells you that's meaningless because there's no #algorithm, ignore them. Sure, boost the post too if you want others to also see the post, but don't think telling someone you like what they posted is somehow unimportant. In real life I don't tell someone, "good job," or "well said," or "I love that," for the sake of some algorithm, I do it because I'm human and they are too. It's fundamental to being truly social.