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Antonio Conte system heavily depends on strong striker like Romelu Lukaku to score goals which can be big problem in Premier League if that player is not performing well. You are right that coaches need to find other ways to score especially against defensive teams because relying on just one player makes team easy to stop. Geat coach must be flexible and use skills of all their players not just striker.
He should make himself so strong that he does not depend on any player while he can make himself strong and a good player. This is the weakness of his team, if he does not play well, he can cause harm to his team, whereas I think that if these players try, they can succeed. This is true to some extent, but it also depends on the player to play well and work hard, which will improve him, due to which the coaches should not be so worried, and if even after spending so much money, if the coaches prepare them, then there is no use of so much money. Along with this, the players should also cooperate with the coach's hard work and experience.