+1
I would have thought adjusting the units price or the tiers price would be a better solution. This would also eliminate lv spam.
Likewise for kubel. If kubel spam is problematic just increase the fuel cost. That way a meaningful decision is required. Ie do i spam kubels and delay Lv or do i skip kubel cheese and focus on lv.
So many things in this game could be fixed by adjusting cost alone instead of being overly clever and fiddling with unit stats and build times etc etc.
if you dont change stats too then is useless thats how most unit became usless , too expensive for what they do
ex. if you attach fuel for the current kubel no one is gonna build it i assure you