The ships in Star Citizen are pretty modular too, no?1 more thread, 3rd the same answer from me.
Because it is trade off, it can be done one of:
1. Modular design + no walks -> Elite
2. Ship's fixed role + walks ->S.Citizen.
I prefer to be able to change modules instead walking.
Also I think you're barking up the wrong tree, here anyway. Modularity isn't a reason for or against. NMS has modular Freighter interiors. Space Engineers has ship interiors which you can completely build from the ground up and run around inside. Lots of other games do this, too.
And correct me if I'm wrong but; the settlements and other interior structures in Odyssey that you can interact with now; aren't those made of modular pieces as well?