Laowa 15 Macro shift function is designed only for crop bodies.I don't really get that viewpoint. Sure, variety is nice but if you need a truck do you really care if a manufacturer offers an infinite variety of sedans? What I care about is whether or not a system provides the lenses that I personally need.
For example, I use the TS-E 17L and TS-E 24L II a lot. AFAIK, Sony does not even make E-mount TS/PC lenses. There are a couple of options among the 'wide range of third party lenses' for the E mount, but the Rokinon 24 TS is optically weak, and the Laowa 15mm is shift only, no tilt. However, my two TS-E lenses adapt better than perfectly to the RF mount (better than perfect because the drop-in filter adapter means I can use convenient small ND and CPL filters for the TS-E 17 instead of the 145mm salad plates I used to carry for it).
A shift mechanism is added at the rear end of the lens with a maximum adjustment of +/- 6mm for APS-C cameras, which is extremely useful for landscape/architecture photography for distortion correction.