1. Cooler is fine, build is fine, psu is lower quality, you'll be editing/rendering long duration under heavy loads, and a mediocre power supply is not great for that. With the kind of money you are spending for the build, it's like buying a tuxedo and wearing sandals. It'll work, but you'd be better/safer with a higher quality power supply.
2. You'll get very good performance from the m.2 NVMe, those storage are excellent for large file transfers like video renders.