Well unless you get rid of your case fans your VRMs will be cooled just as well, arguably better because there isnt a monolithic block of aluminum blocking airflow to them.
Now otwer cooler provides good VRM cooling, the only coolers that do that are draft down style cooler like the stock ones. But those are very limited in how well they can cool.
Better to buy a decent mobo with good VRMs that dont put out as much heat + good on board/added VRM heatsinks.
Maybe if people had kept their older cases with side fans instead of jumping on the RGB window train they'd see cooling VRMs is really, REALLY easy.
In my PC, there isn't any 'case' fans left. Radiotors/AIOs in the front and top block most of the airflow to the motherboard area. VRM and RAM temps definitely suffered, so I just added a fan blowing at the cpu socket area.