My comment (spend one day at immigration) referred to pre-Covid. But then (2017) I figured out that I rather do a visa run every 60 days than extend for 30 days. The 1900 THB saved this way payed for the flights, and I saw some other countries to see if they could be an alternative to Thailand. Never put all eggs in one basket! It paid out, I would not have gone to Cambodia during Covid if this had been my first time to Cambodia, but having been here for visa runs from Thailand, I had a rough idea about the country and conditions here.
The Covid extension would be a way to stay in Thailand long-time, but first I don't know how long it will be possible this way, and second all the hassle and uncertainty you describe!