Agreed, but not recc'd yet.
BBs with good crews are ridiculously overpowered in blitz. BB1s with at level non-BVE crews aren't, but it's dumb to base everything on the assumption that people won't be using BVE crews. Plenty of people do, and that's not even to mention mods.
If nothing else, banning BBs/PCAs would limit the abuse of mod crews - although that's absolutely something TNF should take care of themselves instead.
Sure, with no BB/PCA blockshot yorks would farm blitz, but a blockshot york is infinitely easier to sink than a 900SD AW blockshot revenge.
And to be honest, I'd rather play BB1 in GB than in blitz - no matter the crew.
With non-uber crew, blitz BB1 is worse than CA, slow, boring and the autostack overcompensates for you, but in GB you get mostly ignored.
With uber crew, blitz BB1 is a lame easymode farmer ship that's still boring and repetitive, whereas GB is an actual challenge that might require some level of skill.