There seems to be a strange notion that fans of the BG series would know or care how controls are handled in the D:OS series. I've never played D:OS, and I have no intention of doing so. If you're going for the big time by reaching for BG3, the fans of that series should be heavily considered with the controls.
I've played both D:OS 1 and 2. And while I like them both very much I'l tell you right away that I didn't like them because of their control scheme, I liked them in spite of their control scheme