What are the disadvantages of SMT?

Could you elaborate on the potential downsides of implementing a Simple Token (SMT) system? I'm particularly interested in understanding the economic and technical challenges it may pose. Does it have any scalability limitations? Are there any security concerns with SMTs? How does the lack of standardization in SMTs across different blockchains affect its adoption? Additionally, could you discuss any potential risks associated with SMTs, such as volatility or regulatory issues? I'd appreciate a concise yet comprehensive overview of the disadvantages of SMTs.