Sharkbites actually work better with PEX than with copper. Especially near a shower or other closed areas prone to getting condensation on the pipe. The little stainless teeth bite nicely into PEX and the OD of PEX stays smooth against the O ring and can't abrade it. Moist air near a sharkbite on copper puts two dissililar metals in a weak electrolyte- the stainless and copper battery causing copper oxide buildup that can eventually ruin the O ring seal against the pipe or erode the copper until there is nothing solid to bite and the assembly leaks.

Crimped PEX and shark bite are two completely different things. Just like how copper can be connected with both shark bites and soldering.