Seeing as how OKW doesn't get any doctrines with heavy call-ins (unless you count Strumtiger in a pretty bad commander) then pretty much yes.
I'm waiting for your excuse for USF then.
And I dare you to say pershing. There is more then cost alone to make a heavy.
Yes you can argue they are doctrinal but they have a significant cost advantage with no Tech costs aside from Brits. Many (dare I even say most) players will play/stall for these heavy call-ins as a "second chance" of sorts - its not that much different.
Let me in you on a lil secret:
No one stalls for heavies, because it doesn't work with limit of 1, if you forego tech, you're weakening yourself on purpose. Only exception here is Ost mechanized assault, but you're still having mid game armored support you'd be dead without.
You're talking pre limitation meta, which is long dead. Jesulin stalling for call-ins in recent ESL have proven the death of that playstyle with his defeats.
KT is just OKW's version of that. Requiring all 4 buildings will just lead to either A) Making KT more difficult to build except as a coup de grace B) Restricting OKW gameplay by encouraging players to build trucks only in base which goes against OKW's design.
OKW design of building forward trucks died back in WFA alpha.
To put them outside of your base is risk vs reward choice, with mostly rewards, but its an option, not intended design any longer-play aggressive or play safe, there is no bigger depth then that anymore.
Forcing you to make a choice is NOT restricting you from anything, its simply forcing you to make a choice and plan forward, just like UKF does with bofors or AEC and hammer or anvil.
. 122 mm gun are weak for relic 
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