I do not know at which stage Wasabi Wallet (whilst owned by zkSNACKs) allowed external coordinators to be selected but the idea it was wrong for any member (you did not mention names) to advocate others to stop using Wasabi Wallet as being technically wrong is a debate that will be about matters of opinion. If any coinjoin service uses/employs blockchain analysis, they should not
be used.
Average people with zero technical knowledge could not start their own coordinator and even if they had the skills to do so, they would not keep their service open indefinitely if there was a lack of traffic. Having said that, zkSNACKs has nothing to do with Wasabi Wallet and the current developers are not using blockchain analysis.
But OK, it wasn't a problem before zkSNACKs stopped developing Wasabi Wallet though, no? As I have debated before, the people in the community who didn't like zkSNACKs' trade-off could start their own coordinator. People had the right to criticize zkSNACKs, that's understandable, BUT it was NOT right, technically, to tell everyone to stop using Wasabi Wallet.
Tell them to stop using zkSNACKs' coordinator because they're working with blockchain analytics, or any coordinator that works with blockchain analytics. But practically, they're good to have "clean" outputs. If you have "tainted" UTXOs, this might work - Send your tainted UTXOs to yourself through the Lightning Network, then CoinJoin through a coordinator that works with blockchain analytics.