I don't fundamentally think a master suite on the ground floor is wrong. In other countries, people like to build that way (but usually with more children's rooms upstairs). I have a house in Chile where exactly that was planned, also with a large glass front facing the garden and terrace. That we moved it upstairs is due to our personal preferences, but the suite downstairs would certainly have worked. The question is rather whether the remaining space upstairs can then be used sensibly. If the requirements, for example, state "office/workroom not necessary," that naturally becomes more difficult. In our case, part of the space upstairs is sacrificed to a gallery; overall, we have 6m of air space above the entrance/hall on the ground floor. I would choose that again.