For a new token, it is important when it lists on the exchange, when the market falls or when the market grows. If the token falls, it will be difficult to return the lost positions even after the market reversal.
Listing is very important in all cases. Investors and traders must have opportunity to buy and sell tokens. But when market falls it is not a good time for listing because a lot of investors are disappointed.
Not adding a coin to the exchange with the allotted time is also a bad idea. This one works against the image of the project, although for the price it will be bad, of course.