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.
?? Oil port would only need to be extended by like 0.5" to clear that exhaust pipe, the casing to the left extends probably 1-2" from that. If you lay the bike down it that casing would stop the oil port from being touched. Shouldn't be an issue.
Honestly they sound like asshole engineers trying to justify their poor quality of work. Cardboard, tinfoil, and brake cleaner can’t excuse a poor design.
Make the exhaust curve back a bit? More expensive to make the part than having a straight pipe with just one bend.
Dent the exhaust? Affect flow, create hot spot right under the oil drain plug.
Expect people to be intelligent enough to put some cardboard or foil under the plug so they don't spill oil on the exhaust? Idiots are complaining and posting their failure on the internet and blaming you.
You can plainly see that there's plenty of other material sticking out much further than any 1cm extension. If you were in a crash that ate through all that material first, I'm sure the engine casing would be the least of your worries.