It really depends on the design of the library in question. In iso omena the new library is very open and integrated with social/welfare services so some noise is expected. The library host a wide range of things of public interest such as instrument rooms, conference rooms(free for individuals), vr rooms, pc's for gaming, 3d printing and probably more I'm not aware of. I've noticed a lot of school aged kids just hanging out and socializing in the library. If you really need a quiet space to focus then there is a special study room where noise is not allowed.