We are also in the process of figuring out a redesign for our master bath so your plans appeared somewhat similar to ours. I would suggest though that if you have the space, rather than a 12" wall cabinet, make your vanity 72" and incorporate the cabinet space into the vanity area. 12" isn't very much room to even put a towel so I don't think it would give you a lot of storage. You could put a knee wall on the side of the vanity and put your toilet on the same wall. Move the shower to the other wall in order to make it larger. Without a tub, I think you have plenty of room for a larger shower.

I like the larger bathroom, but I think the doors conflict and it is nice to have them open into the closet. I'd do a good pocket door into the bathroom to avoid more conflict although it could open against the wall next to the sink. You do loose more closet storage, but corners aren't all that valuable in a closet. You could fit a lot of clothes in there by double hanging rods. That would save some money over the Pax system. Plus your closet now seems more separate from the bathroom by extending the wall. Here is another idea for the main bath. My daughter has stacked washer and dryer and is short, but uses the arrangement well. You have plenty of room in front of the W/D to get clothes in and out. The toilet is off to the side. The vanity could be 72 inches with 2 sinks. The bonus is the door would open up against the tub and the room would feel more open. The laundry would be easily accessible without the bathroom door being in the way. Folding laundry in the laundry room is overrated. I had a nice space for folding laundry in our 1 st house with a window to look out. I usually took the laundry to the TV area and sat down on the floor to fold.

Changing the toilet location is complicated and costly so I would keep it where it is. I would however swing your double vanity around so that’s the first thing you see when entering the room. I would convert your tub into a shower and get rid of the dividing wall. The added wall make the room look small and cramped. Below is a photo giving you an idea of what it could look like. The tiles you chose are fine, but keep the walls and cabinets light. Good lighting is essential, especially since you don’t have a window in there. Add a ceiling light in the shower, lights by the sinks and a strong combination exhaust fan & light.

Moving the entry door to the corner adjoining the bookcase along either wall would free up more space to allow a 4-piece bath. For instance, if you moved the door all the way to the left, you would have nominal 5-feet to the right of it, which could give you more room for a shower. Then, in plan C, with a 59-60" tub moved to the right, you could put a custom shallow depth vanity along the left wall that could run to the corner ending in shallow shelves or cabinetry. It would be tight dimensions, but certainly workable. If the wall behind the bookcase could be removed, you could replace with the door and build it flush with the side of the dark square that faces the sitting area, which gives even more flexibiilty. Don't give up yet!