@Marc *********
Not *quite* true, in my opinion.
The multiple entry visas, especially the multiple entry Non-O visa based on marriage to a Thai wife, still has value to those people who frequently leave and return to Thailand for work. However, a person would still have to quarantine for 15 days in a hotel at their expense.
Remember, *MOST* multiple entry visas only allow a person to stay in Thailand in 90 day increments. An extension of stay must be purchased to stay longer.