There are many pro's and con's for each side of this discussion. There are indeed many very satisfied motorhome owners out there as indeed there caravanners. It all comes down to oyur own personal choice, and I also accept that some of use will try the 'other side' to see what it is like, and maybe then return.
A motorhome is a high cost item, but this should be compared with the total cost of a towing outfit, not just the caravan. Yes, many peoplke state they need a car for work etc, but thyen again many retired people are happy to have the single vehicle, especially if they can park it at home. Similarly I feel that one should take servicing and maintenance costs for the total outfit for comparison. Adding up insurance for car and van and service costs for each can often exceeed the equivalent for a motorhome.
I agree that some of the fittings in a vehicle costing 40 grand can be flimsy, but as many are made by the same manufacturers as caravans, then you either get the benefits of mass production, or the downside of uninterested workers. Certain mnaufacturers such as Hymer have very high customer satisfaction ratings for both motorhomes and caravans, yet can often be some of the most expensive. Possibly you are getting what you are paying for. Some people prefer to use a smaler manufacturer where you can get a 'bespoke' vehicle to youir own preference, which is harder to obtain with a caravan.
The issue of moving the vehicle around, especially if it is a large coachbuilt is true. I know, I had one and did it. However, to counterargue, in France many Aires are very close to town centres and therefore the issue is avoided. Visiting tourist attractions can be a problem certainly, but then again many people use a second car or scooter. A SMART car for example is a very cheap ruunabout. Towing it is an issue but many people do so without problem. Again, the total cost of the outfit is in many cases comparable when one considers the price of a good caravan at over 15 grand and a good towcar at about 25-30 grand.
It is all a case of personal choice. I am looking at a motorhome mainly because I want to visit countries and places where taking a caravan is more fraught. I also accept travelling 10 miles down the road from home would not really be a sensible option for a motorhome.
As for getting money back. Buying a car can usually be the quickest way to lose money and caravans lose value very quickly, so again I feel the truth holds for both cases. The one thing about motorhomes is that the depreciation often 'bottoms out' while caravans and cars can keep dropping to virtually zero.
It is a lifestyle choice at then end of the day.