I aggree
The itemsquish would also make for a more fluid leveling experience.
I levelled some chars up doing cata and it was like. 1-58 fine fluid experience your gear gets a bit better everytime. 58 of to hellfire massive increase in stats BAM. Then 58-68 levelling in tbc was very fast compared to back in the day but the minute i hit 68 of to northrend gotta get the overpowered itemupgrades. And as you might have guessed the same thing happened the minute you hit 80 in northrend.
It just feels kinda annoying that effectively all your gear becomes instant obsolete at 58,68, 80 and now 85. And that every content you do those last few levels up to those breakpoints with its item upgrades feel utterly pointless.
Like hurray I got a shiny new sword at level 57 in LBRS, but in 4 bars im level 58 so that blue sword is actually crap.