This hits home. 99% of work for those projects is common sense, and 1% is that special knowledge that you can learn on the job.
OMG. I had exactly the same story word for word until I got fed up with this meat grinder and had started my own business 20 years ago.
The flip side was seeing some idiotic customers you had to build things for that clearly made zero sense, technical or business, and often led you to wonder about your sanity. I worked on one project for several months at which point the company pivoted to an unrelated business, and then refused to pay for the work done, as they no longer needed it. Another project was very successful in fixing their business issues, but they refused to pay for an extra week caused by a relatively major requirement change, so I had to leave the project incomplete. In another project the arguments about signing the contract took longer than the project did, so I was forced to work without any communication with the client.
We did some crazy stuff. Delivered some gigantic ambitious projects with pure chutzpah. Dove into tech we didn't know anything about. Go sell a project to an airline, read everything about the airline business, then walk in like experts. It felt like fraud at times but we pulled it off so well you just start to feel invincible. It was a meat grinder but also thrilling. The kind of stuff I feel privileged to have been part of but never want to do again.