Wasabi Wallet has worked fine for 99.9% of average joes, hence the lack of demand for alternative coordinators.
There is a lack of demand for alternative coordinators because anyone with a shred of sense is not using Wasabi at all.
The solution is there, people just have to be willing to build it.
As I've mentioned before, why would anyone waste their time, money, and resources to set up their own coordinator, spend weeks or months advertising it and enticing people to use it, all so they can run flawed coinjoins, when they can just set up and use JoinMarket in a fraction of the time.
Because WabiSabi allows mixing arbitrary amounts then a lot of muli-input transactions paying multiple addresses could be misidentified as being CoinJoins.
Their amounts are fixed and therefore easily identifiable:
https://docs.wasabiwallet.io/FAQ/FAQ-UseWasabi.html#what-are-the-equal-denominations-created-in-a-coinjoin-round