Why would an embassy program an over the phone interview for a DTV visa, weeks after applying. What is to be expected?

There will be a couple posts from me on this subject sorry in advance. For those of you who find my posts irritating- now is a good time to block me.

Getting ready for my wife to do her US tourist visa embassy interview. I am seeing conflicting information regarding medical exam. Anyone have current and direct experience on this? Required or not? It was NOT mentioned in the information given after the application was submitted and the interview scheduled. I think this is an "immigrant" vs "tourist" visa thing, but I want to be sure.

Need some advice please guys.

I applied for a new tourist visa from PP via an agency in Sihanoukville (used several times without any problems). The agency contacted me a few days later and told me I have to go to PP and see someone at the embassy in person.

I was questioned about why I have so many tourist visas in my passport (I’ve been doing back to back tourist visas for the last 2 years, 3rd in a row from PP).

He couldn’t understand that I wasn’t working in Thailand and I obviously failed to convince him otherwise.

I’m a UK passport holder.

No overstays.

Not old enough for retirement visa.

Not working in Thailand.

Basically I would like to know what my options are and what could possibly happen when I try to return to Thailand.

Thanks in advance.