This is your definition of the OKW faction, not the "official design".
What is the "official design"? Or am I right to assume there really isn't one?
Improving gameplay (i.e. bridging the mid/late game gap for OKW) should never be achieved by commander choice. The OKW PIV as introduced right now is no meta-breaking Ubertank, its just an additional option to compensate for the lack of a fundamental asset every other faction has (medium armor, late game AI armor). I dont understand your argument against it.
Improving gameplay IS acheived by commander choice, like it or not. I don't personally think that's a bad thing, though if it is the ONLY way to improve gameplay then that's something else.
If there was a problem with the lack of medium armour, then perhaps OKW was flawed from the start. Which I don't agree with.
My argument against it you don't understand simply because you think pretty much anything you deem necessary should be core units, not found through doctrines. I don't agree with that assessment, since IMO the OKW works fine without it, and frankly being an alternative to Panther and Puma more or less proves that, it's there as a choice, but no loner as a commander choice. But there's a pretty big difference between 210 fuel 2x P4Js and 1x P4J for 135...a difference that wouldn't occur if they merely adjusted that commander, alongside lower CP of course. IMO that was the real problem with Elite Armoured- the actual unit call-in comes too late, competes with Panther, and units are more a medium-late, not late-KT.
Which are all players? And relic? Who does not benefit from this change? Even allies-only super fanboys wont constantly lose their games to PIV spam now.
I'm a player. I don't see this as the best choice in design. Therefore no, not all players. You can can exaggerate all you want about majority or most, but not all. A change that does not cause problems isn't always a positive and optimal solution.
The result of this change is that more people will use Panzer4. Nevermind being more like Ostheer than I think is necessary, but also IMO people who argued (or whined?) about lack of medium armour as OKW just didn't want to play OKW in a different manner.
On the P4J specifically, since it's clear Relic isn't going to budge about this (and they didn't back when this was first introduced, consider that), the least they can do is introduce elements to the P4J that makes it stand out more from Ostheer's P4. True it already comes with skirts, but I'd say different abilities would at least make it so you're not so much playing like Ostheer, though I can't say I have any ideas at the moment.