The beauty of this game lies in the fact that it is extremely accessible. Combat is easy to learn, but hard to master. ZOS even made it more accessible with Oakensoul if you don't have the skill (or the will) to keep bar-swapping.
To be honest, I used to be a hardcore player who hated Oakensoul's inclusion. God forbid more people are now able to do the content I sweated over to beat with a harder setup (lol). However, I recently put together a one-bar build for a hunter-themed archer, and I’m having a blast. It’s a perfect option for when you just want to relax, press fewer buttons, and still get the job done. Actually, I even beat my previous score record in vMA with this build, hitting over 600k.
Of course, you won't be as effective as someone who has mastered the game mechanics, but it's not supposed to be otherwise. People who invest time in perfecting their rotation should be rewarded. But if using two bars isn't your thing, that’s totally fine. You just have to be at peace with underperforming compared to 2-bar players, but it certainly doesn't mean you can't clear content.