11 May 2019, 10:10 AMA. Soldier
As far as I am concerned the Jumbo could have been very easily added at least as a test to see if the community liked it or not, a blind eye could have been turned to it's few faults like as you said gameplay matters more than being 100% historically accurate.
I won't blame anybody but until Andy or someone else from Relic comes and says "No we can't add that" or something along those lines the Jumbo was always a possibility.
Well, Jumbo is made thanks to special skin to 76mm sherman and only can work with it. From what i see the fire animation would still start at the ending of 76 mm gun.
I would love to see Jumbo in USF but they didn't want to add Hetzer tank destroyer (becouse of the fire animation) so i don't think they will add this one. It's a shame becouse this unit could acually add some character to the commander. Currently it has good abilities (especially for teamgames) but in my opinion it's more like a mix of diffrent slots than a doctrine that has a strong theme. Again, it doesn't mean they did a dead commander.