When you shoot Bullseye for a while it will make two handed shooting seem a LOT easier.
This is very true. As a long-time (over forty years) Bullseye competitor as well as shooting "combat-style" qualification course of fires as a part of my thirty year le career, I can tell you that there are very good reasons why
all tactical/combat instructors and
all contemporary le agencies teach their trainees/students/officers to employ two hands to grip your handgun whenever possible if you ever are unfortunate enough to find yourself in a gunfight: you can shoot more accurately and you have better control over your pistol, both in terms of recoil (for better control of repeat shots) and retention (to keep someone from wresting your pistol away from you).
In terms of using only one hand for Bullseye competition, a one hand hold is considered a
handicap (as opposed to using two hands) and a competitor does so to conform to the rules of the
game. If Bullseye shooters were permitted to use both hands to compete with, I guarantee you that most would, and would without thinking twice about it. I can further assure you that most Bullseye shooters would achieve better scores if they could use two hands to shoot with instead of one.
Of course, getting involved in a gunfight to protect your life is decidedly not a game and there are no
rules keeping you from adopting the best tactical position/stance/hold possible when exchanging gunfire with someone who is trying to kill you. And for most folks, two hands work better than one when trying for accuracy (especially when under fire) and when attempting to control repeat shots. And let's not kid ourselves here: a
lot better.