is it worth training a goalie+defender in Offensive skills and attackers in defensive

[Ro Edu]

i have
GK only defense (49 quality and 62 defense)
Dc (defense only)
Dl/dr (defense and mental)
dmr (defense and attack)
mc(offense and mental)
ml/aml or mr amr (offense only) since i will use only red arrow on them
amc and st (offense and mental)

[shwanko07]

i have
GK only defense (49 quality and 62 defense)
Dc (defense only)
Dl/dr (defense and mental)
dmr (defense and attack)
mc(offense and mental)
ml/aml or mr amr (offense only) since i will use only red arrow on them
amc and st (offense and mental)

disagree tbh
i seen my CM help out alot defending even as last man.. he will need defensive ability too
wingers will need physical side on their game especially with red arrow meaning they will run more
GK, i noted my special one-one GK is letting them beat him easily on 1vs1.. my guess is his lack of pace to track the ball once try the striker try to dribble him or run with ball further to have more space to shoot
I think all players will need physical/mental skills , especially the defenders to keep up with fast strikers