Is epoxy grout more flexible than traditional grout? Assuming it is, just because normal epoxy has some flexibility, could epoxy grout be used instead of silicone caulk in specific places in a bathroom or kitchen: namely the joint between wall tiles & shower base, tub, etc.?
Normally that joint (IMHO) is caulked with silicone. That is fine but silicone can discolor and also is a separate step. If you could just deal with this gap with epoxy grout, it would be done along with the rest of the grouting.
I think one reason that joint requires flexibility is because the shower or tub will tend to flex/move a bit with water and occupant's weight. Would the epoxy withstand that?