DEX DISADVANTAGES :

More difficult to use. -Bancor's UI is extremely user-friendly

Low liquidity. Bancor's algorithm guarantees constant and automated liquidity

Lack of regulation. - Welcome to blockchain

More limited customer service (in most cases). - Bancor's TG channel is extremely active as well as /Bancor

FIAT purchase will never be allowed -You can purchase ETH with a debit card

Slow validation processes, since the transfers are hosted by the blockchain - All transactions/conversions take 1-2 minutes