I had an ED visa for two years. I was occasionally asked to speak Thai to confirm I was going to classes when re-entering the country which was no problem. I have since obtained a DTV, which confirms that having an ED visa previously doesn't cause issues.
of course I didn't mean you personally, it's the widespread practice of many others spending nearly 200 days a year in this country on visa free entries when a long-term visa is more appropriate that the Thai government is specifically trying to address with these policies. As someone who lives in Thailand I feel that the communication is fairly consistent. Foreigners are welcome to come here as a tourist and do what the Thai government considers tourist activities, but living here for hundreds of days on visa free entries that are designated for tourism is not one of them.
at the end of the day, the visa-free entry is designed to allow you to visit once and then eventually if you want to stay longer you have to get a visa. You're still getting the free entry you were promised, you just can't use it over and over again because the length of time you're staying overall reflects the need for a longer term visa. If you're staying in the country long enough to become a tax resident, (180 days) in the eyes of the government, that's not tourism. If you don't like it, you're free to go somewhere else, as you said.