He wanted to only join Juve due to them being the only big club showing serious interest.
Yeah but let's not act like Juventus are not big club now though. It's entirely reasonable that a player would want to play at Juventus. Realistically, at the time of his move from Palermo, only Real, Barca & Bayern would be an improvement and none of those needed players in his position.
You're fully entitled to like Fekir more if you want, but let's not underrate Dybala's achievements in a tougher league and in the CL.