You are wrong in denying that there could be an issue if you try and 'do business' at Jomtien and your TM30 receipt is not 'current'.
I am certainly not suggesting that people run to Jomtien and submit new TM30's - although many have (do it online anyway). BUT, be aware of their requirement to file again if you are not current - they will not do 90 day reports, certificates of residency, extensions or re-entry permits if you are deemed to be 'out of date'.