I disagree with having making bio diesel a better engine. I personally like it the way it is. It fits my playstyle. I load my tank with weapons and overheat often but I don't want to stop moving so bio has that. Also what flasche said. Apart from that getting all equipment from a single tree unbalances the game a bit. Like, if that was the case with bio, you should make the other research trees standalone too. Which doesn't work, because engines and armous are used in different situations. I consider compo and regen an all-rounder because of the regeneration so I believe they would be the preferred research trees. Also @Paradox consider that if you don't get "Optimal tanks" for nobs there's a higher chance they will lose the tank without killing anything or at least getting a point for doing something. Also normal games are more netflix and chill. I personally take my time. I always try getting meds at 15min. works out fine. Point is you don't need to be so fast with research, like, all the time. I understand what you're saying.