Electrical woes!!!

That is just about the best example of a worst case I've seen!!

But I take a slightly different view.

Unless you are worried about "restore correctness" consider this:

Just how many times do you really need to disconnect the bulkhead connector?

Let's say you are completely stripping the engine bay for paint or some other major mod. So, you would normally strip the engine bay wiring, and disconnect at the bulkhead.

BUT once you have the harness stripped (except the wiper) if all the wiring "fed through" the bulkhead instead of disconnecting, just how much more work would it really be, to simply yank the connector out of the hole, and feed all the wire into the interior?

As someone else on here pointed out, "there's more than one way to skin a cat," figuratively speaking.