BNB for example, decreasing after CZ resignation goes to say that the value revolve around the decision made by binance and honestly I don't consider holding exchange token to be good nowadays when exchange are having bad news around basically the investment leaning towards falling instead of increasing.
holding ethereum in the other hand, proven to be better even more so with bitcoin.
i think if the exchange has good background and has been well-established you can invest and hold
go check their track record and check if they have pending regulatory cases because this will definitely affect the price of the coin
exchanges release tokens to fund its own organization for the benefit of its clients so in a way it goes back to you
a lot of exchanges also offer various benefits like discounts or reduced transaction fees if you buy their coin
well at the end of the day holding exchange-based coins depends on your purpose and goal