Did you even look at who you're responding to? Or do you really not believe Capcom when they're talking about their own game vs your extremely limited knowledge of how the game runs?
Yes, I know. And I also know that no developer or community manager will tell you their game is unoptimized.
When a game can run on a console there cannot be an appeal to what the engine is doing that justifies the bad performance, because PC CPUs&GPUs greatly outperform console hardware. As long the code is as well written and matches the effort that was put on the console, which clearly isn't the case.
IF a game comes out on PC only, then you might claim the engine is doing things so complex that you either have them, or need cut features. But if a game comes out on consoles first, then PC hardware power is ALWAYS significantly greater.
You can claim the game is running complex quantum mechanics calculations, but if it's able to do that on consoles then it has to be able to do that much more smoothly on PC.
What we see in current benchmarks is that on similar PS4 settings the PC port uses an unreasonable amount of CPU power. That's an unambiguous sign that the engine is inefficient.
Good multithreading is just one aspect. Just showing that the engine distributes well the load doesn't mean that it is using that power efficiently.
A screenshot that shows a game using lots of CPU and GPU % occupation proves only that the game is making the hardware draw a lot of energy. Again not a proof of efficiency at all.
What happens instead is that there's code written specifically for consoles that won't run efficiently on PC. It doesn't mean that code CAN'T run efficiently on PC, but you'd have to rewrite and re-engineer most of it. This is pretty much universally not something that is worth the effort because PC is not a priority and rewriting an engine is not cost effective.
In the end, companies do the minimum effort that lets them sell the product. Is MHW selling well even if it's unoptimized on PC? If so they have no reason to do any better than that. Just a business choices. You tell your customers to buy a better CPU and you're done.
(plus, the suspicion about DRM, might be just a coincidence, but for a reason or another all games that have Denuvo and performance issues always have them on the CPU side. And that makes the suspicion at least legitimate)
P.S.
If instead the community manager came here to reveal that the PC port was running a more complex game simulation - better physics, better monsters AI and whatnot - then this would justify the worse performance on PC. Alas, this is not the case. The engine on the same setting is running the exact same simulation than on consoles. So the much greater power to run the same stuff just can't be justified.