Ideally the DalSeal TS would fold into the gap between the wall and ceiling concrete board. Blocking should be constant across this area when openings are larger than your fist. After roughly two days I would fill the corner with silicone. Like the example above. This allows for future compression and an area at the corner where things are more forgiving. The perfect fold is tricky and many of my first steam showers where built without the sealed slip joint. Think about movement. We want that inside corner able to move. If you ensure that silicone goes in and that the thin-set and grout do not bind there you should be good to go.

Just regrout. If there are other issues beyond a little grout coming out, like an incorrectly done preslope, those issues need to be addressed by a tearout.

It fails the cleanability test. And the proper waterproof interfacing test between the walls and base.

@jennifer hulse design - sorry for the confusion. The top photo is of the tile elements that were delivered, all for one bathroom. The floor tile is a lot more off-white/beige than the store sample was - the store sample was a creamy white with gray. So I'm not happy with it. As you say, keep beige with beige, and gray with gray. The delivered floor tile doesn't have any gray in it. So for the second photo, I swapped out the floor tile that I don't like, to see how a gray tile (which happens to be what we ordered for another bathroom) would look. Of the two options, I think the gray floor tile goes better with the silver gray baseboard tile, etc. I'm actually okay with the wall tile being slightly whiter (and less gray) than the sample, for several reasons. 1 - the wall tile will only be in the combination shower/tub alcove. 2 - it allows the accent tile to stand out. 3 - it's neutral, and with all of the other elements, gives a little bit of relief to the eye. It may be worth it for me to go back to the tile store and look at other gray floor tiles, but I'm not sure if I'll find something I like better. There is a floor tile that matches the baseboard tile, but I'm not sure I can accept the level of variation that might exist in the floor tile (based on the level of variation in the baseboard tile that was delivered).