Bangkok is easy if you go to the right place and get there early. If you thought you had a visa and went to main office then that would have been stressful as it's the wrong place for visa exempt extension
you get a 30 day extension on a tr60 which extends your stay to 90 days means the same.
I know how the visa stuff works I fly every month and have done for many years and have had many different visa over the years. Go preach somewhere else