I think someone who takes say, a month off per year could still be a professional. Even 2 or 3, which has them working 9 months a year. If you disagree it's not the end of the world. If you have a grounded argument to make in opposition, go for it and I'll listen.

Yes, they will operate in the same way (motivated by money) but they'll do it at a drastically reduced level of societal harm. You come across as someone who isn't greedy, and who understands the concept of "enough" which are admirable qualities I strive for myself - I live on disability payments and largely succeed in being thankful for it. However, making everyone happy with a middle class level of "enough" (i.e. no motivation to succeed beyond that) would require changing the nature of a lot of, perhaps most, human beings IMO. I think it would be a hard sell. Failing to convince at least most people to not strive past middle class living could lead to dissatisfaction, a collapse of the limits we're proposing, and an eventual return to more harmful "norms".