Mike Alternate wrote:
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?

The tape used is the least factor to be concerned with. Is he using FibaTape
Mold-x10 over drywall in the shower? OR is he using it over cement board?

My personal opinion, after seeing so many problems and failures, is that any
gypsum based product, even if it is rated for shower use, will probably fail
or cause problems in time.