Great topic and ideas for improvement. Thanks for sending to Oliver, I really hope they listen, it seems you put a lot of thought into it from real-world experience.
So here are my views. But I will add the following: I don't own an Oliver yet, but planning to buy one soon. Never been in one yet either. My comments below are purely from YouTube/FB etc, so don't roast me 🤣
Most I what I observed is on your very comprehensive list - just writing down the things that jumped out at me:
Need bigger fresh water tank, perhaps option to ditch/convert blank tank to fresh where the composting toilet is optioned.
Need a bigger refrigerator and definitely a compressor style one.
Switch to a MPTT solar controller.
More solar, perhaps a fold-out option (not sure of that is feasible).
Door pockets like nu-camp trailers.
Lot's of people complain the a/c unit is too loud - I see you have that covered above, but can it be ducted too?
Automatic leveling jacks.
Reverse the blackout window blind and screen; blackout should start from bottom to add some privacy, while still letting some light from the top.
Sonos speaker option for audiophiles.
Hinge top cabinets from top and add a gas strut.
Also love the idea of a slightly larger Elite III, definitely wider, but not too much longer. Dry-bath would be great, somewhere to lounge would be nice, not just the bed option. For example, flip-up leg extenders on dinette seating.
Thanks again
Paul