Various people have been arguing this. Also some like reactions and emojis but get annoyed at overuse - saying it's childish. Nonetheless, I don't really care about their opinion. Who cares?
I'm not sure what you mean by credit systems Reactions (like Slack has) make a lot of sense. Telegram is annoying because in order to "react" you have to create a new post which adds to the noise with no benefit If the forum owner has something to sell then having a shop is obvious If you find a forum to be too childish I'm sure you can use google to find another that fits with your maturity better.