In 4th edition, they are great for astral security, scouting, or even just passing messages between party members in two different locations when normal comms might be detected or jammed. Since you summoned them as any other spirit, there wasn't a problem. There were even spells and initiations that improved them, I believe.
In 5th edition, they're much worse, have to be done as a ritual instead of summoning like any other spirit, and in general just aren't worth the time and effort for the trouble. Just another thing 5E messed up.