Logis aren't better assaults, they just have better fitting options to make them versatile. Look at their base stats and compare them to their racial assault equivalent. The Amarr suit is the most underpowered, Gallente and Minmatar are well balanced, but the Caldari racial bonus needs to be reworked. Having up to 35% shield module efficiency is on the level of game breaking. But despite that, flux grenades, scrambler rifles and even scrambler pistols can make short work of them since they're usually slow and 3 out of the 4 suits lack a sidearm. If you can't kill a logi pretending to be an assault, look at the faults in your fittings before you judge another.
I've seen a lot of Minmatar assaults running with dual flaylocks that get 4 shots in the clip thanks to their racial bonus. Are you going to complain about that too because they figured out a new way to play?