In the end, it is the social value of your role what you get paid for, not your real productivity. Maybe not so much back in time, but as time passes and more efficiency is introduced in the economy by means of automation the less important is real productivity for your income.
I work the way I do for me. As someone who is hyper focused on my job, I understand what you're getting at. Before my recent promotion, I was doing way more work than my coworkers for the same pay because I was work obsessed. But it was what I wanted to do. I am excellent at a job that is genuinely important.
At this point I have wholeheartedly embraced it. I've been even more focused since my promotion. I will be the convenience store woman, but for my dispensary. It makes me happy.
I'm seeing it all as an identity thing. You get paid for taking a role which aligns your personal identity with the identity of the collective, regardless of real productivity. I'm sprinkling some Bourdieu into Baumol in seen power structures reproducing themselves by adjusting prices.
The worrying thing to me is when you think you are gonna get promoted for producing more instead of for having a matching personality trait for your next role.