Change your tub to a tub/shower combo and make your closet bigger. Or get rid of the tub altogether and just have a shower (this would be my choice - make a nice big walk in shower against the back wall). Anything else would require reconfiguring your house.

anj_p's suggestion allows for a door between laundry and closet, which makes it easier for washing clothes as well as circulating. You might also be able to make the laundry smaller since the drawing suggests a stacked washer/dryer.

Express your concerns to your "architect". You pay them to work these kind of things out. Verify their license with your state.

I think your solution will effect other spaces other than the master bedroom suite.

Now that I take a closer look at the partial floor plan provided, I think you will benefit from posting your entire floor plan(s) and exterior elevations; but as always . . .

WARNING: Posting your entire floor plan opens you up to facts you may not want to know, but should. Be prepared for suggestions that will make for a better design. Keep a thick skin, open mind, sense of humor, and a glass of wine within arms reach. You may not enjoy it, but everyone else will and you will be better off in the long run if you heed well the advice.