In my opinion, the blockchain has two application targets, enterprise-level and public. When the technology developed is facing enterprises, it is natural that some enterprises do not need tokens to pay. If users are replaced by the general public, then the reward mechanism of using tokens is necessary. If facing the public also use regular fees, then centralized operators can also use bribery to change most of the nodes, which is the so-called 51% computing power attack, which affects the credibility of this system.