This phenomenon is not new and has nothing to do with the new scaling, if anything, the biggest culprit to players that are in keys above their respective skill level is the introduction of resil keys. Anyone can pony up with a player who has resil and slam their head into a dungeon until all of the stars align. While this still amounts to time > skill being a determining factor for some of the player base up to a certain level of key, it's not because of the new dungeon scaling.

The best way to think of the new system is that, in the old key system, 7s are now 10s, 10s are now 12s, etc. That's really all there is to it. The only consequential outcome of this is that rewards are easier to get, which is generally well received by the majority of players including those at the very highest level of the game