It's impossible for many players to reach the high percentiles because it's a percentile. By definition, only 1% of players can be 99th percentile. If everyone improved to the point that everyone was within 200 DPS of each other, only 1% of players would be 99th percentile, but the gap between a 99th percentile player and a 25th percentile player's DPS would be ~5% and not a big deal unless fights are tuned extremely strictly, so only people going for world firsts would be concerned about it.
Obviously due to practice, skill, and gear, the gap will likely never narrow up that much. But you can't focus entirely on percentile as a measurement. It's a useful tool to see where you are relative to everyone else. It's not a useful tool to see if you have the required DPS to clear the content (whereas raw DPS measurements are). Half the playerbase will always be below 50th percentile. The aim should be to help bring everyone up so that the gap isn't as wide as it is now, because right now it's a huge spread.
PPS can measure how effectively you're using your skills, but doesn't tell you "can I beat the enrage?", which is ultimately the result people care about. So long as gear is a factor, it'll be a thing. But yes, it's a useful measurement of how effectively you're using your skills.However if instead of measuring dps you were to measure for example pps potency per second. Then you might find my 60th percentile blm is actually up there in the high 80s maybe even 90s. It's not player skill that's the problem it's simply the power creep of gear.
You then have a scenario where great players appear bad simply because of there gear and available time to play.
Part of this is a mentality issue. If you're measuring percentiles, 60th isn't crap. It's significantly above average. That goes back to how wide the spread between top and bottom is, though. 60th probably isn't going to be enough to do ultimate because it's meant to be super hard for top people, but if the gap is closed somewhat, it can be enough to do savage. That should be the goal, at least.It's another reason why my stuff is hidden on logs because people might look at that see me at like 60th percentile and think I'm crap at blm. But it might actually be a good performance with my gear because I'm whacking out a ton of pps and uptime. Just gear and power creep drags it down a lot.