Even if a post is a couple of days old, I feel like I can still comment and be part of the conversation here. On Reddit, if you miss the first few hours, your comment will probably be unseen, so why bother?
the best thing about the fediverse actually is that there's enough quantity of content that's also good quality, so you're not sacrificing any of the two
meh, for me it's actually the opposite, i remember the first post ever on my reddit account reached 1k the day after, while here i got 45 upvotes on a post i made 6 days ago...