This may be true of the default filmic settings but it is just as easy to configure it such that personal defaults don’t produce this result so its not an absolute… might be important to clarify so that a new user doesn’t take this as an absolute…
Just a quick example here without filmic… recent playraw basic set of modules… quite dull
Filmic v5 with a couple of sliders changed… color pres no some contrast and wide latitude thats it… not even adding any saturation with the midtone slider… and not dull at all… likely even too much but a tweak of contrast and or latitude would attenuate it.
Using something like this I feel like I can get pretty much that same color boost that sigmoid offers without the loss of detail or at least as much that the sigmoid compression gives…
I still think it is likely the shift from the jpg preview to the raw edit that is what the OP is experiencing and calling a color shift…