This is my first big career job and in my limited experience I think I support the idea of a second pair of eyes, with a hybrid on automated testing. It seems more comprehensive and thorough than having a single person work on a task (minus code reviews).
I guess my missed opportunity would be not backing up my pc when I bought one for $600 in 2013 and losing it to a hard drive wipe. Didn’t consider it’s existence when I did it because who cared at the time.