Is b365 suitable for i7 9700k?
There is no comparison with a 9700k. A bios update may be necessary for boards other than b365 and z390 from the 300 series. In addition, the VRM issue is a genuine concern. To get the most performance out of this CPU, you should either use an appropriate cooler like a b365 (don't use the factory cooler") or a 9700k with z390.