Just as the lack of formal CS background imprints on your lifelong experience with computer languages, the same way is the lack of EE background.
From time to time, a recent grad hire comes by, and fixes my work, and shows me where I screwed up with a few calculations on a pocket calculator.
By now, I have my own tiny KiCad fork to make things easier to read and look like I expect it to.
That said, many hobbyists also just ask on the KiCad forums. And I know there are PCB review tasks on upwork.com
Eventually you run into a problem and have to re-spin the board with no margin of extra time (assuming this is for work). In that scenario, having access to an experienced expert is immensely helpful.
Things learned from junior hires: a lot in RF domain, opamps, 74XXX trickery, signal integrity measurements, fiddling with high freq PCIE, DDR, PAM4 lanes in the sciency way, and whole new world of advanced power electronics, and designing it according to standards, and codes...