In my first social linkshell, we started a group to do CoP content as we leveled new jobs, epic fights scraping by and clearing by the skin of our teeth. People leveling those jobs became masters of them as opposed to nowadays burning a job to 99 and then figuring out how your job abilities worked. I got my maats cap back in the day but i still had level capped gear on a mule which i could get to help people with fights. One of my favorites was the mission 2 dragon and eye. After buffing, I'd time myself to see if I could get them killed before the person I was helping got out of cutscene.

Optional caps are a great idea in the vein of level syncing. One possible means of achieving this would be to give the option of 5 level incriments starting at 10 or 20. Ideally setting any obscure level would be great in my opinion, but i'm not sure if that's feasable.

I'd also love the suggestion of being able to earn other points in places of xp while capped. Perhaps people might be interested in rebuilding Imperial standing if they were able to cap at 75, and while under sanction, xp gains were converted 100% into Imperial standing. While in normal areas, under signet, you'd get conquest points, and sigil in the past would yield allied notes.

I do however think that it's too much to expect increased or additional drops based on level capping. Part of level capping yourself is your own chosen restriction and in most cases the experience and enjoyment are the only rewards needed. Don't forget that if you crave rewards, the new high tier battlefields are putting out new gear which really shines and are definitely worth doing. Multiple difficulty settings makes these new fights accessable, even by people who are not geared well.

One thing I really have to encourage is for people who are looking for adventure to get everything there is to offer from the old content, but keep moving. New content has been flowing steadily from the devs lately, the quality of life adjustments are making the game more playable than it ever was in the past. THE best place to look for adventure and team building is the new content. The same thrill that you remember from climbing delkfutts tower can now be found by fighting your way through colonization reives from town to reach a wildskeeper reive and taking a single alliance in to fight it. Not so long ago, I went into colkhab with 5 friends. 1 party, didn't shout, just told linkshell. We went in and fought bee learning it's moves, the nuances and really practicing our roles for fighting it on different jobs. The content changes, the day changes, the challenge moves. It's up to us to find it.