I am neutral on the native coins of exchanges, I believe they are better than those coins that do not have real use cases. They are even better to those altcoins that has no fundings. The success of the native coins of exchanges is dependent on the performance of the exchange since they are the ones supporting the growth of the coins. So I am not bearish or bullish about these kinda of coins. But it is not bad to at least some of the native coins of popular exchanges like Binance, Kucoin, and Huobi since they have the capability to "pump" their native coins.
Centralized exchange coins are linked to those exchanges. Most of them only offer discounts on trading fees, participation in IEO, staking rewards, etc. All of this activity evolves around those exchanges, which makes them highly centralized. These coins should not be in a long-term portfolio with no use cases outside of their own platform.