That would mean you're not on one page with the others about what the project is meant to achieve and what not.

E.g. let's say one library is more privacy friendly and the other allows more data collection, depending on the project both could be pro or con. I respect developers who value privacy, but if you don't know whether a program is meant to collect data by the point you discuss library choices that eindicates either bad project planning, bad communication or both.