It kind of sounds, like you would add a RNG-system to a system that got introduced to have less RNG.

I would just want the old system back honestly. They made far to many changes at once in my eyes.
Regarding the other stuff:
1) If you run into a fight, kill one or two enemies and flee. It sounds pretty cheesy for me. We always only used flee to escape and accidently triggered fight. If we started a fight and we failed or died to often, we would reload and start it new using a different approach. If you just hit and run you kind of deny yourself the real challenge. (Also backtracking can take ton of time, even more without pyramids.)
2) Soloing will always use cheesy tactics, just because of the pure amount of enemies. Otherwise as you said, going in with a team of four would just be boring. (If you solo Hit and run is probably less cheesy and just necessary. To cheese means to abuse game mechanics to get yourself a unfair advantage, solo is about giving yourself an unfair disadvantage, so I guess, they partwise cancel each other out.)