How does the length of health insurance affect the O-A visa validity for retirees in Thailand?

Many ways of trying to get around things is when you get caught out and end up paying more.

No need. Once again many ways to get around this. Do people on this page automaticaly equate a rule with having no other choice than to comply with that rule? Do we apply that logic to all areas in life or just the bs Thai immergration rules designed to fleece the foreigner out of as much cash as they can.

For OA visa make in your home Country you need the Insurance for one year, without this you dont get the Visa.

This is the links about insurance that Thailand immigration accept

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I was always told you had to purchase a 1 year cover for the OA or they wont issue the COE.

Doesn't affect the validity of the O-A VISA <-sticker from the consulate at all. That visa sticker is valid for a year from the date they issue it.

What the insurance does affect is how long you get stamped IN to the country when entering on an O-A visa.

As a rule you get stamped in for as long as your health insurance is valid up to one year, BUT if your insurance is valid less than that you will only get stamped in until it expires.

If you are coming for 7 months on that O-A visa then get 7 months of insurance, (meaning that's ALL you'll get stamped in for when you arrive). Then leave the country and if you're coming back before the visa sticker expires buy a YEAR of insurance so that when you do come back you'll get a new stamp for a year.

The expiry date on your covid insurance will be the date that your passport is stamped until.