Do I need to change my return flight to cover 90 days for my STV visa in Thailand?

The user inquired about moving their flight date earlier while holding a Short Term Visa (STV) in Thailand, specifically if they need to adjust their return flight to comply with the 90-day stay requirement. Comments indicate that while immigration may ask for a return ticket, it seems not strictly enforced for STV holders, especially since the visa allows for extensions up to 270 days. It is suggested that purchasing a low-cost onward ticket could be a workaround if necessary.