Is a return flight required when entering Thailand with DTV approval?

When entering Thailand with DTV approval, a return or onward flight ticket is not strictly necessary according to several users' experiences. They reported that while filling out the Thai Digital Arrival Card (TDAC), providing a flight number for an exit from Thailand was sufficient. Additionally, it appears that the exit flight details are not mandatory on the TDAC form, as users successfully submitted their TDAC applications without completing this section.