2 weeks ago I transited at Doha and showed on my phone Thailand Pass, Test Result and Hotel Booking. Previous month on the same flight I did not have to show anything.
I was informed by staff at the gate that they had been instructed by authorities in Thailand to check all required documents carefully. As I waited for the bus to take BC passengers on a tour of the airport about 5% of passengers were turned away for further checking by a supervisor. All were eventually allowed to board but there were a lot of confused and worried faces. it would be better if airlines informed passengers what is required and in which format.
For arrival in Thailand I always print all required documents. In my opinion it is easier and quicker for staff to read. Having said that I have always shown my vaccination certificate on Morprom without any problem.