Many PEs don't even bother with Psi. They use a dex glove to reach higher TL weapons. The benefits from the low level shields are minimal (8% for absorber IIRC, hardly worth it). Then when you get to team PvP, they are inconsequential, since they are over-ridden by PPU buffs.
Indeed, a key problem is that the high TL weapons do too much damage and the lower TL weapons don't do enough.The fact is some weapon need to be less powerfull because they have a smaller TL. TL is a base of neocron's build