We actually started out our retirement nomadic life sans RV. We thought that the temporary housing model would offer a relatively inexpensive lifestyle that optimized freedom. It didn't turn out that way for us.
1) For us, it turned out to be expensive. Unless one is willing to spend time in the very least expensive motels, your average name brand hotel/motel would eat up most budgets. We focused on AirBNB and VRBO. Yes, there were some deals on monthly stays and we lucked into some great opportunities. But over time, you really do get what you pay for. (Pro tip: Don't trust the photos and descriptions on ads.) Again, unless one is willing to pursue monthly/longer stays in the most meager places, AirBNB and VRBO get pretty pricey--especially in pretty, tourist-oriented places that we wanted to visit. Top tier RV parks/resorts deliver comfort and amenities at a fraction of the cost of similar temporary housing.
2) Freedom--or lack of. We envisioned a spontaneous life and spur of the moment decisions. One can do that, but living that way probably means that your staying in hotels or pitching a tent. We found booking AirBNB/VRBO at the last minute impossible for us. Smart shoppers had already booked up the optimal places months before. So, we were left with expensive places or dives. This forced us to start booking months before hand and there went our freedom. We were tied to a schedule. Twice, we had to cancel reservations and lost big bucks.
After six months of this, we bought an RV. We got the lifestyle that was exactly what we'd been hoping for--a balanced affordable, nomadic life with gobs of freedom. That's our experience. Your mileage may vary.