1. Use of government hospitals, when not required, takes away a slot that a Thai without other options may need.
2. Private hospitals often have government hospital doctors - allowing doctor time for a more detailed exam.
3. Government hospitals are often too busy - and they know it - and will recommend Thai that can afford other treatment to do so.
4. Waits in government hospitals can be excessive
5. Run around system can be a total nightmare to navigate, even with Thai speaker.
6. As for English in Thailand - English has been actively discouraged here for decades, as other countries welcomed it. Even having a store sign in English entailed extra costs.
7. As for promoting private hospitals - have never got that impression from poster - indeed she goes out of her way to warn against such thinking. And actively recommends government doctors/hospitals when indicated.