Yeah no one is asking for 1 shield to be the only one you use ever... but you shouldn't have to switch so often between shields in the middle of battle that you blink like a Christmas tree. No one else does that... and before anyone brings up the argument of brd or mages blah blah that's only when doing something when everyone maccros stuff in not during the flow of battle based on what the enemy is doing.
More importantly if aegis can't block and the mob uses a decent amount of magic moves what is even the point of using pld? You will be eating tons of dmg and status effects from normal attacks/moves while stopping about as much magic dmg as a RUN... who with it's ergon weapon can prevent a lot more physical not to mention it can stop a lot of status effects too and deal more dmg not that anyone cares about tank dmg lol
And ochain is already outdated in terms of total physical dmg prevented by shields that take at most a couple of hours to make