My contractor uses SHEETROCK® Drywall Joint Tape to tape outside the
shower stall and a "classic" fiberglass mesh joint tape FibaTape inside
the stall.

While the latter is mold-resistant, is it still good only for outside
of the shower stall, and a more advanced FibaTape Mold-X10 should be
used inside?

Or would it be years (if ever) until I see the difference?