I like Arenvald but he's a non-entity for most of the game's story. If someone didn't talk to the NPC's in Vesper Bay in between errands back in ARR then they'd probably have no clue as to who Arenvald even is. Especially since ARR was almost a decade ago by this point.

The adventure into Skalla with Arenvald was pretty neat back in Stormblood in 4.1 but after that he basically fell back into obscurity until it was time for the the finale of Shadowbringers and he was brought back to the forefront, made to seem important and then thrown into a wheelchair so he could once again be shuffled off into the background where he would have been residing ordinarily.

Arenvald's situation isn't really on the same level as it would be if G'raha ended up having his lower body paralysed rendering him unable to fight.