What are some drawbacks of ENS?

Could you elaborate on some of the potential disadvantages of the Ethereum Name Service (ENS)? I'm curious to understand the limitations or challenges that users might encounter when utilizing this naming system. Could you also discuss any security concerns or issues related to privacy that might be associated with ENS? Additionally, are there any scalability challenges or performance bottlenecks that could potentially affect the usability and efficiency of ENS? I'm interested in hearing about these drawbacks to gain a more comprehensive understanding of the system.