Lol ya I was able get that before reading that line. (though I do understand your reasons for stating that, there are bound to be people that might get that confused, just letting you know I can understand such things)
For your point, that is def also an issue, however there is very well the issue people under gear too much as well (though what you described is most likely more common)They use ilevel high right side while having a gimp left, stepping into some instances where they can be oneshoted from unavoidable damage and so on. So yeah I do agree your point is an issue, but so is entering places undergeared so much so it is hard to pass with them in the party.
When you get a DPS in expert that cba do the level 70 quest and have under i290 left, it usually shows 2 things. One they do not know what they are doing in general, thus the low DPS output, so low you might be there 35 min+, and the other, because of such a low experience in the game in general, trying to rush like that, they are legit not ready for level 70 endgame and understand rotations.
no, Augmented does last a while and that is a good thing since you don't have to worry about gaining exp faster then you can collect gear on the way. In other words, having a mix of Augmented gear in mix of dungeon drops is fine x7 to x9 levels (59,69 with their respective Augmented gear) this is less about having i270 in a 69 place and more so having i250 or less in slots while trying to do a level 67-69 df. (or entering i90 and under for the first HW dungeon) Being i270 in castrum abania is fine as long as you know what you are doing, and often seen i270~~ outperform higher ilevels from knowing what to do, as long as x situation can do it in 20 mins or less, there is not really room for an argument to be made of "x is an issue" You may not be doing the super mega pulls that overgear can do there, but it is not going to be insanely slow, like some may bring being say i250 and not knowing rotations.
Trying to "nerf" the effectiveness of the best gear in how long it lasts in the next expansion would only make this matter worse.