I've been quite hesitant about buying a Corsair case after what I considered to be a poor showing with their 3000D. I bought one pretty soon after it released, and the metal pins on the hard drive trays were rusted. Not that it hurt anything, but given that I had just spent $330 on a brand new case, I expected to at least open the box without any internal blemishes (excluding potential shipping damages). What also irked me is that the 3000D was billed as a case designed for custom water cooling, but it had huge deficiencies... such a the lack of a good spot for a water pump. Don't get me wrong as it had plenty of open area, but it just lacked a good mounting platform. This was before fan-based mounts were really common, but even if they were as common as they are today, it would've only had a single spot available on the back of an HDD cage.
Although, looking at the 4000D, it's odd that they'd reuse that name for such a low-end case. One thing that I'm not a fan of is one thing that you mentioned... the USB ports. First of all, I don't understand the obsession with USB Type-C on a desktop. Don't get me wrong as Type-C has its places. For example, it's great on mobile devices, and it also works well on laptops or other integrated devices that can use it for USB-PD or Thunderbolt. A random desktop port doesn't get any of those aforementioned items. Depending on your motherboard, it's either a USB 3.1 Gen 1 or Gen 2 connection, which makes it no different than the Type-A connector near it. The important difference is that almost none of your cables will work with it, because USB spec denotes that end-points are supposed to be a Type-B connector (or Type-C). So, your Type-A to Type-C cables can't just be flipped around and used in the Type-C port on the computer as the remote device will likely have some Type-B or Type-C connector.
Ultimately, not to sound like I want to rail on Corsair, but I feel like they come out with interesting products that just don't really hit the mark completely. For example, I have a Commander Pro, and it's not a bad product... except it has a horrible stock mounting. Similar components from other manufacturers have magnetic mounting solutions, which actually work, or sticky solutions that are strong enough to stay. The Commander Pro didn't stay attached to my O11D XL for more than 5 minutes before it fell down. (Add to that how it appears to no longer work correctly as it fails to report voltages and doesn't report the water loop temperatures.)