Welcome to the CommUNIty!
I can’t answer your question directly because I have not yet use a handlebar, but I know there is at least one very accomplished rider that does not use one. His name is Joe Myers, goes by the handle ‘bungeejoe’ here. He has some cool videos on this thread; Learning the 36 Inch Wheel
He doesn’t use a handlebar in these videos. He does ride with clipless pedals, which is pretty incredible.
As Sask said, I think many/most riders use one for various reasons. There are a bunch of information rich threads–if you read through this one you will find links to several others that have great ideas and info.
I bought a Nimbus Titan in January and so far I really like it. I upgraded to a KH Freeride saddle, and also bought some longer cranks (170) to learn with for the first while. There is a lot to learn. It is very different than riding something smaller. But it certainly is a rush, and I wonder if it will actually replace road cycling for me. It has for some…
Good luck in your adventure, and keep us posted on your progress (assuming that Santa might just find a way to come 6-8 months early this year :D)