Centralized wallet usually more convenient than decentralized wallet.
On centralized wallet, you can have more than 1 coin there, such as btc, eth, xrp, usdt, all in your single account.
Using decentralized wallet is secure, but it needs more knowledge to use it so we can manage our wallets effectively.
Im also using a centralized wallet (its our local wallet here), but my only purpose for using this is because of the convenience to cash out and because it has also features that you can pay directly your bills and top up your phone instantly. Other than that I dont store my coins for long period there, its risky. If you dont hold your private keys then its not really secure.