This is something I realised a lot talking to my therapist over the years, that one of the reasons I was constantly burning out was because I was usually 100% task focused and people would be amazed at how much I got done all the time. But most people kind of just naturally tread water or like basically just do enough to make it seem like they are not doing nothing. On that baseline, I also came to the same realisation as you. The whole of the working world is based on just about passing as not incompetent and then people do what they like the rest of the time, but nobody explicitly tells anyone this because then the illusion would be broken I guess. Everything is performative, the stupid evaluations or target setting they have you do is just stuff you know you can do anyway normally but you slack enough to make it seem like it's something you 'worked hard for'.
The plus side is when you realise this, it means you can gradually start to give yourself a break. Obviously it varies based on the nature of your job, but I'm talking about stuff that isn't super high stakes.