It's highly recommended.
I was like you before joining, I just wanted to be vaccinated for the 2 mandatory ones. But when I went to the clinic and the nurse asked me where I was going to be flying, she printed a list of all the vaccines I should get, and that was exactly the same as the one provided by flydubai.
Don't forget we go to many different places, and we have layovers in countries like Bangladesh, Uganda,...
Also, some of the vaccines are combined, so for 6 or 7 vaccines I only got 3 or 4 shots.