Aye, the point is doing what you enjoy, as I prev stated. You want to play 5 shammies- go for it- enjoy! Just be ready for the VERY challenging endgame if you intend to instance.
If you enjoy and thrive off that challenge- great. it can be done- it has been done. Not arguing that. Just saying its probably not even close to the optimal mix for this sort of thing.

And yeah, i'm still not impressed with the advice given. Nothing personal there. But you confirmed my exact concern about the expressed interest in heroics yet still give the advice to go that way? *sigh*