Sensors on full-frame DSLR/Mirrorless systems are large so you're going to have to keep a significantly sized rectangle clear.
Assuming right-handed use, you're going to extend that rectangle to the right for a grip, that also need to have depth. Not optional as any of these cameras might see some very heavy lenses attached to them.
You need a viewfinder, where the only logical option is on top. Same for flash connections. The only alternative is no viewfinder at all, just the back screen, but this can't be done because sports and wildlife photographers will always require an eye piece.
All connections (video, mic, data, remote flash) have to be on the left as the right side is taken for the grip which typically features the memory card slots.
The bottom of the camera has to be flat, it needs to support tripod use, video brackets and battery grips. Realistically, the battery chamber can only be at the bottom, given that all other space is already used.
Concluding, the layout makes sense. You could move around connections but it doesn't change the shape of the camera, nor does it improve anything. So it's a logical timeless design, not really a prestige thing.
As somebody else already said: the old design was not specifically analog, only the internals were.