Yes that is true that Antonio Conte is popular for his style and reliance on specific players like Romelu Lukaku. And his success in winning titles proves his methods can work with he uses main striker or more flexible attack. His teams do not always depend on one player for goals. Instead of this they are designed so that goals can come from many different positions making team harder to defend. And some teams have struggled without consistent goal scorer like Arsenal and Chelsea having top forward alongside other attacking threats gives team more options and depth to win in different situations.
Every coach has their own plan for maximizing the strengths of their players, although Conte focuses a little more on players like Romelu Lukaku for finishing. If he were coaching a Premier League team, it might be very difficult if a striker doesn't live up to expectations in terms of goalscoring, so other options should also be considered as a way to maximize existing strengths.
The luck of achieving the Scudetto without pressure might be an opportunity, but in some cases, it can be a burden. Strikers are not always in a position to score goals, especially when facing a more defensive team, so coaches must find other options to achieve their goals.