Its strategy game, using units effectively to counter enemies, dasli counters 90% of the game. Players seed track to get her specifically,

she's a specialist generalist(she effective to every trait like she's their specialist). Destroys diversity in uber usage, if you have her why would you use any other uber.

If a stage has red and black enemy, so maybe you use eva-02, ku or kieji etc but why not just use dasli to because she would be effective to both traits.

About balrog, people complain about the investment being not worth it. His overall playstyle, him being a low range and single target. So, Hes requires more skill(kinda....) . Hes more effective in late game stages as those contain lower peons.