What are the disadvantages of EOS?

Could you please elaborate on the potential downsides of EOS? Are there any significant security vulnerabilities that have been identified within its architecture? Additionally, how does EOS fare in terms of scalability and transaction speed compared to other blockchain platforms? Also, could you discuss any governance issues or concerns that may arise within the EOS ecosystem? Furthermore, are there any concerns about centralization tendencies within the EOS network? Finally, how does the cost of transactions on EOS compare to other cryptocurrencies, and are there any fees or costs associated with participating in its ecosystem that investors should be aware of?