Where did you ask? The discord or the mailinglist?
While I was a bit more active (author of the HeapFeeder), the discord was nice for some discussions, but the mailinglist had the most reach.
On the other hand, you are complaining that people in their free time are not supporting you enough, even they had written a whole wikipage dedicated to that topic (and you choose to pick one of the "not recommend" options).
Many things are not recommended, I was interested in what is recommended. And those options are either not available, or priced out of range. I understand they like to push their Smoothieboard, that is fine, but then it should be available, and it's not. In short, an up to date list of models would be a good idea,
And for the support, we are all active in many groups and reply other people questions in our free time. I have no complain about that.
Anyway, seems my board has some type of fault that I can't fix without manufacturers support - and their support sux quite badly. I know, those China stuff and that I should have known better .... ;-)
Anyway, hope that one day in 2022 I will get my Marlin board working and then go from their.