Finishing, as in will power, focus, and vision, is like a muscle that you can take to the gym.
This advice is the equivalent of going for a run one day and never picking up the habit. I don't think it will lead to fitness.
Lately, I envy my better half who reads all books from start to finish, and also manages to be very consistent in teaching specific things to our children. This is Doing More With Less in practice -- in the long run, children obviously benefit more from that as compared to inconsistent creative bursts that I (currently) represent. Order is much harder to accomplish than mess; I think ultimately, good learning = keeping order, and being consistent about what not to do.
(I do remember Nassim Taleb advocating to read books "ADDHD-style", as in, swapping right away when you feel bored, though. And he is quite good with his probability stuff, so threre's that. Also, I quite like Perl and Larry Wall's views on the inherent messiness of human language -- I think he is spot-on with this. But... as a layperson, it's nonetheless way too easy to get lost inside this mindset. Managing complexity is an art, I guess. Or, as somebody once wrote on the Perlmonks forums, "freedom is hard".)