Not to detract from the very good point you are making, but wining and dining stakeholders sounds exhausting. I would definitely consider myself "on the clock" for such an activity.
Those that think it's not work, I challenge you to close a multiyear, multi-billion deal with Boeing over a few dinners, and then tell us how it was just a walk in the park.
You can do it.
If you're closing a high stakes multi-billion dollar deal with Boeing then you should count that as work, definitely.
The problem in my view is not how we categorize work vs non-work but how people homogenize different types of work to create unrealistic expectations of what work is and how much of it we should be doing.
People like to think that "work" is always doing things you dislike but it doesn't have to be.