Is it necessary to have prepaid flight and health insurance when applying for an OA long-stay visa in Thailand?

When applying for an OA long-stay visa to Thailand, it is essential to provide copies of health insurance details. While it is often recommended to have prepaid flight details, it's not a strict requirement for the visa application. In case the application is denied, the consequences regarding prepaid arrangements may vary, but typically, there are options to adjust travel plans accordingly. Some discussions suggest considering the retirement O visa on arrival as an alternative to reduce the burden of mandatory annual health insurance.