I think they assume that somebody who applies for a visa for over half a year to live in another country doing Muay Thai training at least should have some previous experience.
They just want to check if your application is genuine.
My reaction is about you calling people in this group rude, obviously you read it and don't understand it, I will remove it because it is not informational for anyone else than you.
You indeed are ALLOWED each question you want, but when you ask a question that is asked several times a day in a group, you can expect reactions you should first look around if your question is asked before, that is just general netiquette.
The big difference is DTV is made for 180 days stay with you can extend to 360 days and Elite is for stays of 1 year which can be extended to 20 years without leaving the country once.
So compare 360 days to 20 years, which is quite a difference
Are you sure married to a Thai citizen will make it possible to have a bank account even when you are just a tourist doing some soft power activity or remote work?