I take pride in caring about what matters most for customers (such as end customer impact during production incidents, but also in general prioritization). This is why it's stressful to be on call at times, because I don't let myself truly relax and do normal life things outside of work (because taking a laptop everywhere isn't compatible with some activities).

It's possible to believe in a company mission, and even to drink the company Koolaid to the extent one might romanticize on YN (I did in my early days, while also resentful of the demands of oncall), but it is not necessary to give all the hours of your day to any company. Also, I do enjoy engineering, so your hypothesis is also off base in that regard (in fact I don't really care much for the idea of professionalism). I know plenty of accomplished and happy people for whom work is just one part of their lives and not their defining attribute.