I too have grappled with this for a while but I believe this struggle was for the better and it eventually led to reduced stress. Nowadays when I mentally proclaim "I am done for the day!" I know that I did my best and that I have put enough hours / effort to not feel guilty about not putting more.

So yeah, you are right. I just think people should go through this fight for discipline because it's ultimately better for their mental health when they learn to put boundaries.