I don't think it sucks as much as you think. There's definitely problems, but I think they can be solved by making tweaks to what's there as opposed to completely changing it to be more like the RTS style of BG, Pillars or Eternity, etc.
If you get rid of the headaches of things like stealth, pathing, etc. Then I really don't think it's that bad. I mean this system was basically used in DOS 1 and 2 and tons of people love those games.
If people love DOS games it doesn't mean they love everything about them. I enjoyed them very much but I absolutely hate this chain system. And why make all those tweaks when you can just use a normal established system?