I'm not going to argue schematics of sentences, nor what can be considered similar nor what is late-game, especially not for a unit that is at the very end of a doctrinal track.
So, what type of play does the EZ8 has got when it arrives 16-17 minutes? Barely 2-3 minutes of perhaps a chance of killing a medium? No wonder I haven't seen it for ages in any 2on2s, and if there were any, it just pinged against my panthers.
I questioned your points not to debate semantics and definitions, but because you used them as arguments to support your points. But these support are objectively not true.
It's not a specialized late game unit since it comes at a similar timing as the OKW P4.
But I agree that the EZ8 will have a hard time finding a proper role with both the normal Sherman and the Jackson on the field which are not part of the rework. At 16-17 minutes it can fight mediums, which is its intended role. At 25+ you will run into Panthers, there is not much reason to build it over a Jackson. The EZ8 is just bad in the late game because the game shifts away from what it counters.
Question is if we just accept that this unit will be for 1v1 and maybe a bit of 2v2 only where mediums have enough room to breath, so dedicated medium counters are viable. Or if we want this unit to be viable in all modes.
Why would you build a tank that is only good to fight mediums when you can, for the same price, build a tank that is good vs medium and heavy tanks.
It is not only the combo M4A3 / Jackson that is good, its the logic of building a sherman to punish infantry while able to defend itself vs medium (with the appropriate support) and then build a Jackson to fight anything armored.
Questions anyone should answer are:
Why would you build a M4A3 then a Ez8?
Why would you build a Ez8 first and then a M4A3 or Jackson?
Why would you build a Jackson and then a Ez8?
Agree with that, the EZ8 will probably not have a real niche. One solution could be to make it just a bigger version of the normal Sherman, similar to how both T34s work now. But for this purpose it needs better AI. It could also be good to give it a stun shot similar to the StuG, which lets it scale better against heavier armor.