Is it mandatory to have a hotel and flight booked in TH prior to submit the application?

First I need to know if my visa will be approved, then I plan my trip. It's a common sense.

I'll be applying workcation from my home country in case it matters.

The user manual.pdf from their website mark accomodation and flight as mandatory, but the examples are for different visas, such as tourist and diplomatic visa.

Any clarification would be helpful.

Thank you