From my experience long periods scattered through your life is better. I was able to retire in my early 30s and have just engaged in intense multi-year periods of work since, always with gaps of a year or more afterwards. It allowed me to spend more time as a parent, more time with my spouse, and to spend time doing fun activities I will not be able to do in my 70s.
I think some professionals will have trouble adapting to this because there will be a strong impetus to "advance their career" rather than take a gap. But encouraging this mode may encourage people to take these gaps, and in fact improve the balance vs today's system in which it's mostly women who have trouble advancing because of time off with the kids.