In my experience, in all low-end programs (Wyndham Rewards, Choice Privileges, Best Western Rewards), the only useful benefits to higher status for most people are the extra points and perhaps early check-in.

At Wyndham Rewards, you don't get "upgrades to a better room" in general with Diamond, you only get:

"Suite upgrade at Participating Hotels, subject to availability, in connection with Qualified Stays, Go Free Award stays and Go Fast Award stays, in each case, booked by advance reservation. Availability is determined by Participating Hotel at check-in and is only applicable to the Member’s personal guest room. Suites are not available at all Participating Hotels."

https://www.wyndhamhotels.com/wyndha...ember-levels-3

So unless a hotel has suites available, there's no "upgrade" policy that applies to a Diamond at Wyndham Rewards.

In my experience in multiple low-end programs, hotels which you visit repeatedly are more likely to give you upgrades "to better rooms" on at least some of those stays, just because the hotel knows you, than you are to get an upgrade due to status in a low-end program at a hotel you're visiting for the first (and maybe only) time.

Low-end hotel programs are very different from the "major" hotel programs with regards to upgrades. (Though at least one "major" hotel program, IHG, doesn't generally define upgrades for earned status either!)