Playing with the sheet music is a big distraction for me.
After reading the article:
If I play from memory it´s because I already learned a piece well enough, because I already applied every resource I have to learn a piece, I´ve studied the score well enough, made an analysis, etc. so well that I naturally memorize it, sometimes it takes 1 week, sometimes 1 day, sometimes half an hour, but never have I felt it´s like some kind of "tradition", for me it´s part of preparation and quality.
Unless there´s a special case, I believe a case where someone couldn´t memorize a piece it was most probably just because of being lazy rather than a "problem" with memory. NOTE! that by this I don´t mean it´s wrong to play with sheet music, you can know a piece from memory and STILL prefer to play with sheet music. It´s just the memorization part, I believe it has to do a whole lot more with work rather than with personal difficulties.
Take for example other instruments apart from the piano, they usually play with sheet music because they usually play in a orchestra which always play with sheet music, it´s not about a problem with memory, it´s just that they´re used to play reading. Or accompanying pianists, they start reading and reading and reading all filled with wholes and vices and mistakes, and then when they want to memorize a piece they can´t because of lack of work and lazyness.
It´s just like when people say it´s "bad" or "tirany" when you practice more than 4 hours a day, yeah right, I want to see them try learning a whole recital program that includes a Scriabin sonata and or a Prokofiev concerto by practicing just 4 hours a day.... it really depends, but I can bet everyone that most of the cases are just them being lazy and not depending on their skills/difficulties. Pianists like GG or Horowitz or Argerich can say that they don't practice at all, but if you read their bios you´ll notice they say that because during their student years they practiced AT LEAST 10 hours a day.
End of rant.
But anyways, if it really isn't a matter of lazyness, then I don't see the problem with playing with sheet music, but for me it is a distraction.