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?
On an entry stamp is never information about how and where you applied, what is your point? There are a lot of different visaclasses and types, but on the entry stamp only the class is mentioned normally, so you can have same stamps for different types in a visa class, which means on an entry stamp you cannot see which visa type you have.
Of course it is the same stamp, the stamp is just an entry stamp and is used for all visa and even visa exempt entries in the country, so it is not even a visa stamp...
With handwriting or sometimes another stamp they mention the type of visa.
My point is that it is of no interest at which date in a calender year you stay 180 days, for the whole calendar year you are considered as tax resident.
Not exactly, when the moment you are 180 days in Thailand in a calendar year is in let's say December, you are tax resident for the whole calendar year starting at January 1 and ending at December 31. So money you bring in January can become taxable when in December you reach 180 days.