There is Immigration Office policy and then there is the actual Thai law. The law states that if entering and receiving a permitted to stay stamp (every DTV entry) then you must file a new TM30. Those entering on long stay visas using a re entry permit do not as long as returning to the same address. Domestic travel and return to the same address also does not need a new TM30 to be filed.
as normal your logic is flawed. Things that are not required generally are not written down. I am not required to enter accompanied by a pink elephant, I don’t think you will find that written down anywhere. On the other hand things that are required are generally written down and in the case of government rules and regulations published and communicated. Please link to the official source that details the entry requirements you must fulfill each time you enter on a DTV. You will fail as they don’t exist except inside your head.
You will not be arriving on a visa on arrival as a UK passport holder. This basic misunderstanding tells me you have done limited research into your travels. Please do some serious reading and then come back with your questions.