In OSM many longer easy hiking trails in Switzerland are interrupted by rural asphalt roads and run along them. This results in many rural paved roads being tagged with sac_scale=hiking.
This renders the road bike profile completely useless because ways tagged sac_scale=* are being rejected according to the documentation:
i think this should rather be fixed in the OSM data: https://wiki.openstreetmap.org/wiki/Key:sac_scale
if you look at the description of the sac_scale tag, this should not exist on a road with highway:unclassified especially if it is asphalted.
If you still want to vote for a different tag filtering for the road bike profile, please open an issue in our backend repository including examples, so this can be further discussed there.