Well they are not THAT much bigger, are they? Remember, this shouldn’t be compared to the huge spacewalking suits, this is “just” the suits they wear while sitting in the rocket. Even the current ones are pretty tightly fitting. I feel the size benefits are a bit overemphasized.
They are certainly much nicer and the detailing is very science fictiony, I really like it, especially when you compare it to the current ones that are clearly made by engineers (which I fundamentally can’t really blame them for because how many of these suits do they actually produce? A few dozens at best?).
Good for them to realize that the cost of the few designers they need for this suit hugely outweighs the benefit of having super cool looking space X astronauts in all their press material! I wish more engineering focused companies would approach their vision a little bit more like that.