Is there a downside to Coinbase?

Certainly, I'd be happy to provide a description in the tone of a questioner regarding the potential downsides of Coinbase. "I've heard a lot of positive things about Coinbase as a cryptocurrency exchange, but I'm curious if there are any potential downsides to using their platform. For instance, are there any fees that might be higher than other exchanges? Or are there any security concerns I should be aware of? Additionally, does Coinbase offer a wide range of cryptocurrencies to trade, or are there limitations in terms of the assets available? I'd appreciate any insights you can provide on the potential drawbacks of using Coinbase.