Just a few; 1. hard to open bankaccount. And yes some say they managed it. Nothing is 100% in Thailand.
2. Only a 2 year driving license. Those who had a 5 years license go back to 2 year at next renewal. 2 years license is not accepted in many places to show ID. Its a temporary license.
3. In any situation you are dealt with as a tourist. I could come back in Thailand in covid time on a non o more quickly then tourists.
And there are more issues. We not even know the future of DTV because of the many obvious frauds concerning obtaining a DTV.
Thai governement is aware of this.
Get a visa that meets your purpuse. Retired and longstay wish. Get a Non O.
Digital nomad or going on a longer training/medical treatment get a DTV.
If you are at the immigration and got your extension then consider to get a re-entry permit while are still there. If needed in this extension period. Cost you maybe less then 1 hour in time and 1000B for a single entry or 3800B for a miltiple re-entry permit.