The Centralized exchanges ( CEXs ) are essentially traditional web platforms in which, after a document registration process, it is possible to exchange traditional currency (fiat) with cryptocurrency they own.
If you do not intend to stay on the platform for simple trading and you need to move assets in decentralized networks, the CEX does not offer maximum convenience.
The process can be long as it requires several steps:
registration with verification of documents, bank transfers, blockchain transactions. Other than that, the traditional and gas costs for each movement must also be considered.