I play the arty reg a lot . . . yeah it doesn't have a use and just takes up a slot.
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Then you are doing something wrong. Try the call in arty with for continues fire with sextons...
Its vet bonuses don't help its lethality though like T70 or luch. It's got decent starting stats but doesn't pick off squads as fast as other light tanks at vet.
If you implying that it gets bad vet bonuses you are mistaken, else you are simply misleading the vet bonus Valentine gets are great and very good for the role of the unit.
It's s much unit for recon, arty and some extra AI power before it gets invalidated by P4 a minute later.
IMO unit is fine, but its supercharge ability could use a bit of a buff considering you need a sexton to use it
It as unit much cheaper than PzIV so I am not sure what you expect to vs PzIV, but trying to kill a vetted valentine with PzIV is allot harder than you claim.
The victor barrage does not need any buffs at all Sexton can already fire almost non stop with it.
Ro. Artillery Regiment is very powerful Commander that does not more buffs, most of the abilities are already very powerful.