Different doesn't mean, that they should get better versions than the origianl fractions.
They have 6men + merge, in 3vs3+ that mean endless Vet3 units. That isn't fair and if you call that asymetric balancing, than please visit the psychologists.
E.g. Osttruppen are balanced, the have quicker refesh, but for that they are easier to hit.
They get a "better" version if they take it. I say "better" because if you recrew it with anything but cons you are overpaying to reinforce it and cons have an above average target size.
Merge comes at lacking on field healing and ONLY having 3 buggy ladies that have to wank each and every man to get them into fighting shape- but sometimes a lad gets a little too into it and keeps the lass from moving on, assuming they don't get drawn to your allies to try and escape the soviet union....
Trade offs. Strengths and weaknesses.
Easier to keep units on the field, but spend more time in base when forced off.