We talk to them because they're part of the body of Christ in which we are all connected, they're just in Heaven already and we are not.
(So we being many, are one body in Christ, and every one members one of another.)
Rev. 5:8
Rev. 8:3-4
There is no indication in any of scripture that saints is not a term to describe all those in the church or that only some people go to heaven when they die and everyone else has to wait.