You're not alone, I definitely spent the majority of my time on 720p rips. I couldn't tell the difference between them and 1080. Though these days, actually just recently, I've switched over to 1080, and I can tell when it's lower.
But most my collection is still 720 and I feel no need to go back through and update everything. Maybe when I get arr set up I'll let it go through and do it for me 🤷♂️
Which thread? I'm casual, I don't have time or energy to keep a good ratio. I seed plenty, but it seems like private trackers, for all their benefits, would also be a chore. I've looked into them before but never got past needing an invite.
At this point in my life I'm not concerned about the highest bitrate. I use yify for all my movies, and 1337x for TV shows, grab them in full seasons as I need them.
I'm open to new ideas, though, if it's not too hard to get started.