Personally Id like to see the likes IX instead of the XI, I think a 6pdr equipped version at BR2 would be very nice to have, it would be balanced as well since the IX lost the coax gun to fit the 6pdr at first until the later turret redesigns. (Would also work well as an event soviet squad, though at BR3 instead since you could use the uparmoured versions of it that were soviet made, commonly giving armour about on par with the KV-1).
Instead we could see the Cromwell’s appear to fill BR3 for british lineups.
Matilda, Chaffe, AC1 none of them can be penned by BR1 Japanese tanks.
The reason its not a major issue yet is because they are heavily limited in number because they are premium.
This thing would be very weak for a BR3 tank. If we work under the assumption that the 6 pounder Valentine is fine at BR2 (which I personally think is plausible, the 6 pounder isn’t some crazy powerful gun for BR2 which requires being paired with a tin can to be balanced) then the 75mm Valentine might also be fine there as well considering that it would only get solid shot AP. If it’s still too strong then it could be possibly nerfed with a slow rate of fire considering that the gun is mounted in a two man turret which is probably quite cramped.