already in the game Grim Dawn v1.2.1.6 Playtest Changelog (but RoS “spam” got slightly reduced frequency to compensate)
you shouldn’t as “blitzer” if you’re asking “optimally” speaking, simply because you forgo CDR options that would make your warlord overall stronger.
Otherwise it’s a flavour option for you (nothing wrong with flavour/not everything has to be “optimal”)
shield doesn’t make you default tanky, let alone as inquis with 0 shield bonuses.
Think of it as a bonus to 2handed firestrike users, ignore the aura of censure stuff, in that way it can be used as a potential levelling weapon until you get Blazerush for endgame, nothing wrong with that/items existing as levelling intermediate.
yes, again, “best” vs fine/playable is 2 different things, but 6 guardian builds has existed for a fair long time now