There seems to be a belief that merge request tools are meant to be only used to point at things to correct. I am guessing not many FLOSS projects would survive consistently using them so.
Mmm, I tend to accept that commenting directly on code in MR tools is usually for hilighting something which needs attention. I use comments on the MR itself to say something along the lines of "This looks excellent, thank you" or whatever. But I get your point for sure.