C1 won't process a file until they have developed a profile for the camera which took it. They were very late in supporting the Leica SL because they didn't get a loaner from Leica to work with and finally borrowed mine for a week. Although X Pro2 and X T2 files must look essentially the same (both could be developed immediately in AccuRaw, my backup system) they didn't develop X-T2 files on release either. Adobe LR decrypts the compressed Fuji RAF files using code that they obtained from Fuji. There are some third party tools that can decompress a compressed Fuji RAF (again AccuRaw can do this, using code based on someone else's hack of the Fuji compression scheme). It slows things down and could change without warning. C1 apparently chose not to do that. I shoot uncompressed RAFs and compress them a days worth at a time, including the metadata files in the directory, after I have rendered them. I think my overall compression ratio is probably a bit better this way.
I don't think there is any connection between Film Simulation and decompression. These occur at different stages in the process.
scott