I'm helping a relative and a friend with problems in their bathrooms. Both had the corners in their showers grouted, instead of caulked. Both now have cracks all along the corners. It appears the grout is original to construction on both, and I can't for life of me understand why the contractors would do that. One of my in laws has a business doing custom kitchen and baths, and has been in the business for 20 years. He said any contractor who grouts corners, instead of caulking them, is an idiot. I agree.
That's bad enough, but the previous owners at one house decided to "fix" the problem by slathering silicone caulk all over the cracks.
The cracked grout is bad enough, but a straight forward fix. However, the caulk over grout is a nightmare.
Anyone who does this is a horrible person.
END RANT.