Imbalance is only one of several "ills" of excessively porky eyepieces.
A case full of eight-element eyepieces is heavy and adds to the hassle of loading and unloading as a result. A tall, heavy eyepiece is more apt to unscrew an SCT diagonal during a slew. A heavy eyepiece is more apt to damage itself on impact than a lighter one (hits with more force). Those are just a few examples.
The number of ills associated with lower weight eyepieces is smaller (like everything else about them ).
Regards,
Jim
-------------------- "I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me."