They can keep drop rates low on more over powering gear, but I would hate to see it raised a little on rare gear thats not gonna last you for quite a few levels. Something thats only gonna last 5 levels shouldnt be super rare, but if its lasts 15+ yeah it should have a lower drop rate.
As for the loot system, that one is kinda tricky. I would like my own loot pool, but I do kinda miss the old lot system from xi. I think the personal loot pool would be better for the general population, but then they would have to make a lot of the drops tradable. Greed and jelousy will always cause conflict when it comes to loot. I would say maybe a mix sysrtem, something like alldrops outside of chests are community, but every NM leaves a chest exclusive to each player that participated in the fight. All non-tradable gear would be in the chest, and tradable gear, and crafting mats would all come off the group pool. Its almost a lose lose situation when loot comes into question cause either which way you go youre always gonna have some dick whose gonna lot on everything or somebody cring over how they lost on a lot, or thier luck sucks.