I think, this article is interesting, definitely, but for me it is very attatched to cash games. I would like to read similiar about SNG and Tourneys.
I guess, then somehow things could become different again.
I can play very concentrated up to 3 tables. Also 4 are ok, when they are of the same type. But as soon as there come more types into play, also different than NLHE, it becomes harder in my opinion. Sometimes I have more than 3-4 tables,
but then it turns to a little bit stress for me, also because of my small monitor.