I forgot and checked back into my home 2 months late and nobody at Bangkok immigration raised an eyebrow when I renewed my Visa. Depends on the officer I guess but I reckon it's low on their priorities but I'll still continue to do it.
Yeah you are lucky if your 90 day matches up with your visa. I have always left the country during my visas so the 90 day is reset upon re entry, putting it out of sync.
Reminder to all that they are now enforcing that you must wear long pants and shoes at government buildings or they won't serve you which has changed since I went last year for my bile license and shorts were ok. Got my 5 year car license on Wednesday at the main centre at Chatachuk and would have been done in an hour except when I got to the physical tests they said I needed long pants. Quickly went across to the market and was lucky to find some. Girls with short skirts are still fine though 😂