I think less people makes it harder to get lost so it’s worth commenting. If you sort Reddit by hot, there’s already thousands of comments and most likely no one is ever going to see your post. So why bother? Most of my posts on Reddit are in small subreddits for pretty much the same reason I comment more here.
I get exactly what you’re saying but I’m not sure I have a great answer for you. I think it’s all about dopamine. Smoking cannabis reconnects me with that childlike feeling. Also, having a kid really helped me. Seeing the world through her eyes as she experienced childhood is amazing. Before kid I felt like I couldn’t really enjoy anything like I could before without drugs. I’m not sure how much of that is depression and how much is just getting older.