My opinion? You're creating an additional failure mode, or two....
Long cords are MUCH more prone to getting tangled on deployment, causing problems.
Plus, a long cord can allow a parachute to bring part of the rocket to a dead stop, while the rest continues in free fall, until WHAM! It hits the end of the cord. saw that just this past weekend. That puts one heck of a shock load on the system.
The "blow it up or blow it out" mentality is part of the problem, as are long cords.
Enough charge to reliably separate, but not so much that it blows things three miles apart, a bagged main with a pilot chute, and a short riser, and you're good to go.
We recover 150+ pound components this way.
-Kevin