Remember when Jon stood around in Kings Landing while the men in his command started killing surrendered soliders snd innocents. Apparnetly he knew nothing on how to stop it
Just free ballin on a dragon like Jon and Daenerys do is a wild oversight in the show. You would HAVE to be harnessed on to a dragon or you would fall off to your death immediately. People can't hold onto a bucking rodeo bull on the ground for 8 seconds let alone a dragon in flight.