I agree with your point i'm not convinced too, but we need another guy other than Cr7 who is able to score easily, if not Dybala then Icardi who is the occasion of this summer.
While Icardi-Ronaldo may have some problems coexisting, Dybala hasn't a place in a 3 attack and we already know this, but i still much rather those 2 options than Chiesa-Ronaldo-Costa that may be cool tactically speaking but very poor score-wise.
Bernardeschi, Mandzu, Cuadrado and Costa have very little numbers, only Ronaldo is reliable and as much as i'd love to see Dybala become a Juve legend it's either keep him and bring back the deadly striker he was once, or if they don't believe in him anymore, sell and buy Icardi.