ما هي سلبيات سولانا؟

Concerning Solana, I must inquire, what are the potential downsides or negatives we should be aware of? As a cryptocurrency, it seems to have garnered a significant amount of attention in recent times, but it's always prudent to understand the risks involved. Could you elaborate on any scalability issues it might face? Are there concerns about its centralization tendencies, given the role of validators in the network? Furthermore, how secure is the Solana blockchain, and have there been any recent security breaches or vulnerabilities that have been reported? Understanding these negatives would help us make a more informed decision about investing in or utilizing Solana.