This is encouraging. Struggled with limited attempts at Fusion mesh conversions too. Likely depends on what, specifically, one feeds it in terms of mesh type/structure. Haven’t compared yet to Rhino 6.
It looks like there are new options (not in Fusion) inside the Speedform tools dialogs. Seems aimed at accurate design with greater ease - less hoops to jump.
Still logical there may develop a t-splines lite, and t-splines pro, so to speak. Dunno