i think what you say is true about 3-betting hands you open-limped with, but it sends a lot of money into the pot when you are oop.

pp's <TT at lower stakes are calls from anywhere to me.
sc's while others (3+) have also called the raise in front of you.
and AXs/KXs with the same conditions are calls for me.

if a hand does well multi-way, and favorable conditions are met, i will likely just call a raise.

however, if i want to thin the field with AQo or others that do not do well mulit-way, and i think i can "sqeeze" the others out, i 3bet...although rarely.

of course, all of this requires a decent read on your opponent(s) , especially if you are trying to isolate one for a HU battle.