To clarify, you do that when you want to balance only WB? That would make sense to me.
I just wanted less crap hanging off the packs when running them. If you do have tons of space in the battery box, then its not a problem to have a big ass bundle of wire there.
Much depends on the use pattern, mine is a big pack for occasional 2c discharge, but mostly the pack is so big its running on .75c. So balance is not a problem, literally balance them 4 times a year, and never found on very far out yet, in years. The current pack is a full 2 years old now. Still stays in balance.
When assembling a new lipo pack, I won't tolerate an individual pack that does not stay balanced initially, so no weak cells ever in my assembled pack. That means for me, balance wires are not needed whatsoever.
But if you need them, for sure, go ahead and hook them up. But if you do and discharge, it becomes even more crucial that you never have an accidental disconnect of the main wires. You could end up pulling 10 amps through that balance wire connector.
So if you do have them attached all the time, I'd strongly recommend a solid soldered or crimped permanent parallel connector at the main wires.