I’d say in a year or two Gaijin will have to look at paper’esque vehicles yet again because right now you can almost see the bottom of truly unique vehicles’ stocks of some nations (e.g. Japan and Sweden).
Obviously people will still say that this SPG has a different optic for commander or this light tank has a seat placed 0.02 mm to the left and thus is to be concerned a unique separate vehicle, but even then, with such approach, there are definitely nations that will run out of original content sooner than the others.
One may say sub-trees solve this issue (JP housing Thai, Indo and soon Malaysian vehicles; SWE housing Nordic countries), but at the end of the day Gaijin would treat them as filler nations for C&P in research tree and truly unique vehicles as premiums/events.
Spoiler
But hey, it is still unique addition, right? Just like you asked. Wdym you didn’t want it premium? Or limited time event? You just cried for unique vehicles entering the game, here they are! The format? Whatever! That’s different subject, and, you know, it costs billions to model new stuff, and C&P is almost free, thus it has to pay off somehow, you dum dum!
Regarding blueprint vehicles, I’d say I am more against it than for it.
I am for it if a) it’s not game-breaking and a complete non-sense, like Ratte P.1000 b) it has some of its components actually existing and be capable of being operated in proposed composition, like Swedish Kranwagn c) it was actually considered for production or was supposed to undergo prototype phase, or even started going through prototype phase, but was halted due to reasons (e.g. Japanese/Italian planes/tanks that were about to enter prototype phase, but the end of the war deemed them unnecessary and impossible to be continued).
I am against it because we ain’t playing WoT that has all tanks of a kind and is rather a realism slop 2x than just realism slop we have right now.
I’d say that such [grounded blueprint] vehicles should always be concerned as limited time event premium so that their nature of one-of experiment is preserved in a more proper way. And something that was actually in steel, like T58, be squadron or researchable (I’d say wooden mockups can also be treated in the same way as steel ones, but that’s actually a different subject).