I agree except when it comes to major or structural modifications. They are not always possible due to the way modern RVs are constructed. Even if you could make major modifications, the resale value of a motorhome could plummet.
As an example, to get close to what I want, I could buy a used Axis 24.1 (would never extensively modify a new one) and permanently remove the sofa slide. In its place I'd build a narrow 2-person booth dinette. The biggest problem is that not only would I spend lots of money on the project, I would also reduce the value of the MH. On the other hand if Thor deleted the slide and installed a dinette like on 25.2 floorplan, it wouldn't cost much (should cost less) and wouldn't affect resale nearly as much.
I could also relocate generator in a 24.1, and modify rear storage to make it more MegaStorage-like, but that too would add a lot of cost and adversely affect the resale value.
I think you are correct if talking about minor upgrades like shower curtains, adding solar, or even upgrading a refrigerator to residential, but any modification that is major would be a huge risk.
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