You need to look at the context. Sarri had to revert to a strict possession game to avoid having the gaps in midfield being exploited during defensive transition. We then all saw how redundant our football became, needing Hazard to save us on occasion.
Havertz, Werner, and Ziyech don't fit in this system either. We expect to compete against Liverpool and City with CHO and Pulisic as our attackers supporting Lukaku? We also still have the same issue of lack of creativity in midfield if we are wagering Mount, Kante, and Kovacic to create our chances.