No, this is not asshole design. If the oil port was sticking further out, it’s gets knocked off if you lay the bike down. And then you have no oil at all, and a blown up motor.

It’s by good design the oil port is recessed. Yes it’s annoying to use a funnel, but it’s the preferable option.

Well the problem with that is when you lay the bike down, the oil port gets shaved off and you lose all your oil. Don’t ask me how I know.

So yeah, it’s a PITA to use a funnel, but it’s still the preferable option.