Yes it seems easy on the theory but hard on the practice...
From my experience on the nt's, i had a PF which is probably one of the best multiskilled player in his position, but i had serious doubts about what i had to do with him when we were facing teams with high monoskilled players from the inside. Most of the times i avoided to put him to play 30-40 minutes in front of mono-skilleds player, but his performances on the 10-8 minutes he had, wasnt bad.
The fact is that this game engine still give more chances to the monoskilled players than to the multiskilleds or the players that trained their secundary skills over 8-9. I suppose this will change in the future and we will see more options in attack or in defense so the multiskilled players can be more usefull.
Just an example coming back to the PF's, even if you have a PF with a 9 on OD and you are playing a 3-2 zone and theres a play where the other SF trys a shot attempt in front of your PF, even if your PF trained OD as a secundary skill, if the SF is a great shooter its really hard to defend it and most of the times this situation finish with +2 or a foul from your PF.
At least thats what i have seen from my experience on national teams, that we are 2-3 steps forward to the teams, its still important to have in some positions good primary skills, because they can make the differences happens