You’re probably thinking this would trivialize the game, but I think it’s actually kind of a good idea for player retention. A lot of pvp servers dry up because players literally lose everything they worked their butts off for in raids.
But if you could have a set of core equipment that you’d never lose, at least you could never be 100% wiped off the server.
Secondly, this would encourage more pvp interactions out in the world where people would actually fight to death instead of run away all the time.
Also, it would make raiding harder because players wouldn’t have to scramble for equipment as they respawn; but the attackers would still have the advantage of retaining their buffs, and the game already punishes players for repeatedly dieing by increasing their respawn timer.
The only caveat is to just make it so that players only keep their items on the hotbar and armor, while everything they are carrying still drops this would prevent players from simply just grabbing all their loot in a raid and just logging off.