A roll holder on a LF camera, be it 5"x7", 4"x5" or 3 1/4"x4 1/4", is still a LF camera but with a smaller format adapter. All the advantages of the size, mass, and volume of a MF camera are lost when using a LF camera with a roll adapter. Nothing snarky or trolling in that. It is just the way it is. I like my 4"x5"Graflex Model D and my 4"x5" Pacemaker Speed Graphic, but with a film holder they still cannot perform like a MF camera even when it is using 120 film.
The OP asked about MF in the MF forum. The OP did not ask about adapting a larger camera to roll film or even 6cm x 9 cm. The OP asked specifically about 6cm x 6cm. Are you saying that you know how the OP should make choices and live his or her life better than him or her?