While I would love a drain plug on diff covers that is the one of the things that keep me from buying them.Those look good, but with most aftermarket diff covers you are still only supposed to fill to the factory level. They usually aren’t actually much bigger. Most lockers fit just fine behind a factory differential cover. Overfilling will likely result in a leaky wheel seal.
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At least with the ARB's you have the dipstick.
I figured if I bought them would put the proper amount in according to the specs and mark the dip stick.
While I know it it probably a waste of time I check my diff level with every oil change.
I open it up, give a squirt, let the excess dribble out, and cap it off.
With some aftermarket covers cause of what you said, no dipstick like the ARB, you can't do that and never really know where you are at.