I know the (possible) lack of ship interiors (at launch) feels like a kick in the balls, but it's also one of those things that may seem simple, but is a whole rabbit hole of headaches and work for a fairly limited reward.
We already have cockpits, so at the very least we should be able to get out of our chairs and walk around those, right? Well, okay. When? If we can stand up at all times, what happens if the ship is in flight? Does the ship keep going? Can we only stand up when the engines are powered down? What about multicrew or NPCs - can we walk around our ship if someone else is flying it?
Maybe that's too complex, and the safe option is when we're landed on a planet; the same trigger for being able to access the SRV, that code's already there. Maybe we walk to the door at the back, and that's the interface for switching to outside. But how long before the novelty wears off, the walk gets tedious, the cockpit isn't enough?
So okay, give us the whole ship to walk around, then. It can't be that hard. But what about passengers, where's my VIP cabin of NPCs? What's the point of walking around inside a ship if some doors are off limits? Or should the game populate your passenger cabins with NPCs as appropriate, based on the missions in your journal?
And okay, if I can walk around inside my ship, and I can meet other Commanders on foot, why can't I invite them onto my ship? In person multicrew not holo-presence, surely that should be part of it else it breaks immersion. And so on, and so on.
We all know how video games work. The player base will never be satisfied with the bare minimum, but trying to do ship interiors "properly" has so many challenges and so much work before it becomes anything aside from just novelty value. Should they dedicate resources to that, and have a big chunk of the work on their paid DLC go towards novelty fluff... or do they save that for later, deliver it as a free addition post-Odyssey, building on space legs at a time / in a way that isn't directly paid for by us?