creating new role for players is it worth the effort?

[hudai]

I used to think having players capable of playing in multiple positions is useful. However, I've come to learn that multi-position players won't be as good as single positioned ones.
For instance, a DC/DL at 120% is made up of attributes for both positions. That means, the player may have 110% tackling (DC), 140% crossing (DL), 130% strength (DC), 90% speed, etc.
On the other hand, a pure DC at 120% will have high stats that are limited just to its single position, like tackling, marking, strength. Its rating won't be boosted by DL stats like crossing, speed, aggression, etc. I hope I'm explaining it well.

yah im having the same feeling. and while wasting training sessions for a new role on him others have gone up from 3*to4* and 4*-5* :/ so feels like a bad decision from my point of view. well you get to learn from bad decisions. he was my best assist player and now he is drunk on the reserve bench :'(