Examine these two portfolios, this one and then this one. The attentive reader should pick out several similar pictures and at least one that is simply a very very slightly different angle removed a few seconds in time, and then converted to monochrome.
Ming is a smart guy who understands that portfolios are a good end goal. I am fairly confident that he would assert that he shot these pictures with the final portfolio in mind, and I am fairly confident that is not true.
Whatever the true state of Ming's mind, the reality is that virtually all amateurs roam around just shooting stuff, hoping to make some sense of it later. The notion of moving parts of the process from before the shutter press to after is a long standing one both in photography and on this blog. Mostly it doesn't matter or is a good thing.
Ming often pushes the creation of portfolios and the distillation of ideas to after the shutter press, in my judgement. This is one of those places where I opine that the movement to post is an unalloyed bad thing. You are, in essence, shooting stock photographs for yourself. These aren't pictures with purpose, they're just the sort of thing you tend to shoot. You'll hunt around for, and impose, meaning afterwards.
This is also the problem with Vivian Maier. By simply picking out the good ones, her curators have made some pleasing and fairly coherent works of genuinely good pictures. These things only work because the photographic cognoscenti still believe that the individual frame is the main thing, so a pile of them in a row is good enough for a book. There is something missing, that perfect fit, that sharp edge. How can you hit anything when you don't know what you're aiming at?
Compare Maier's books to Frank's Americans. The latter is a fucking violent blow to the head. The former is a nice coffee table book.
I don't know what you want to do, but I'm shooting for more violent blows to the head and fewer coffee table books. If my books aren't violent blows to the head, they should at least be tasteless jokes. Anything but a nice coffee table book.