it certainly sounds like thailand, sadly, isn't/was never the place for you;
1. I do not want to spend the rest of my life jumping through endless hoops to be able to live in Thailand. Too much stress.
i have recently changed to retirement extension status, sure it was a bit time consuming to set up but not difficult and certainly not stressful. i went to CW and found all the IOs i dealt with to be helpful and friendly.
2. I don't have enough savings to deposit 800k baht and not not touch it for 5 months and also not touch 400k for the rest of my life.My monthly is not an issue.
if you dont meet the basic financial requirements then thailand long term is a non-starter - it's a no brainer
3. I don't want to live with the constant changes and consequences if the rules change and I no longer meet Thai requirements.
immigration policies change in every county, that's just how it is, they dont change excessively often here and legitimate ex-pats who meet the criteria generally have no issues adapting.
4. I cannot afford the cost of comprehensive medical insurance. At age 66, I do not qualify for any reasonable premiums. My Medicare premiums the USA is a fraction of what medical insurance will cost me in Thailand.
if you can't manage the financial cost of living here then up front you need to seriously consider if you should live here
5. I do not like being stopped by immigration police outside my apartment and demanding my passport and documents and fearing arrest and possible deportation.
not sure where you live but in 20 years in bangkok i, and all my friends, have never had to show passports or any documents to the police. i have never feared arrest or deportation, as neither would any normal law abiding citizen.
what what activities where you getting up to to draw the attention of the police and make you fear arrest and deportation?!
6. I am tired of the smog.