I agree with you. Personally don’t use facebook but for instance, when I upload videos to my vimeo free account, I fed them frogs in the shiniest possible dresses (x265 10bit). Nevertheless they end up converted to a medium rare 8bit x264 
The WF I described above is mainly for sending people ref visuals and for my blog stuff. Realistically I could compress them quite a bit more and most people would never notice, but again I tend to inject loads of botox-grain in my monster-princesses and their faces melt badly. The backed up edited tifs and downsized jpegs are uncompressed.