For steel frameset, is it better to keep all the screws in even unused (e.g. triple fork mounts, attachment for derailleur housing when singlespeed, bottle cage mounts) to stop water and mud from entering the frame, or leave the holes open so frame can dry out easier inside?
I would say better to have them in. The frame will probably have breather holes in the stays and bottom bracket shell as well as holes between tubes to let it all breathe
For steel frameset, is it better to keep all the screws in even unused (e.g. triple fork mounts, attachment for derailleur housing when singlespeed, bottle cage mounts) to stop water and mud from entering the frame, or leave the holes open so frame can dry out easier inside?