So if the third party coordinators are not publicly accessible, how is the average Joe going to use them? It would also be trivial for Wasabi to answer this question - just pull every Wasabi coinjoin from the blockchain, and then subtract their own ones. The fact that they don't tells you everything you need to know.
He can't tout "Use a third party coordinator" as the ultimately solution for every problem Wasabi has, when he knows fine well there are very few third party coordinators and the ones that exist have almost no volume.
And none of that does anything to solve the rampant address reuse, some coinjoin participants receiving zero privacy, or Wasabi grinding outputs in to dust as has been discussed elsewhere.
Wasabi Wallet has worked fine for 99.9% of average joes, hence the lack of demand for alternative coordinators. That's not really on them if there's no alternatives or there's not enough volume. The solution is there, people just have to be willing to build it.
You would probably get a lot of false positives if you are relying on blockchain analysis to determine what is or isn't a WabiSabi transaction. Because WabiSabi allows mixing arbitrary amounts then a lot of muli-input transactions paying multiple addresses could be misidentified as being CoinJoins.
The address reuse issue has been discussed extensively since 2019. It's not that hard to go on Github, social media, and blog posts to see what was causing the issue and what measures were taken to prevent this from happening. Not every instance of user error or misuse can be prevented but I have not heard of this still being an issue besides a claim from a Samourai-ran twitter account where it actually turned out it wasn't a Wasabi coinjoin.
The grinding to dust accusation is not really something I had heard about so I haven't looked into what it's all about. The claim seems to be coming from Samourai so I would take it with a grain of salt since they are known to lie and exaggerate.
It only takes zero clicks to have your coins coinjoined with JoinMarket with various takers, as the software automatically switches to another taker in case one denies to have you in your round.
JoinMarket is great and a viable alternative to Wasabi. It actually has more volume than Wasabi and Whirlpool combined according to the most recent publicly available statistics that I could find. Using JoinMarket alone isn't enough to give you perfect privacy. There are several theoretical attacks which could happen on JoinMarket as well. According to their developer:
Joinmarket has never been something you can use in a simple way and expect defence against active attackers./url]