Quote "Yeah, but then he'll lose all the value that DNGs bring, WB for example"
Yup, but he can adjust white balance in Lightroom just as wel, before exporting to TIFF's

But if you search on the internet for tutorials of DaVinci Resolve Lite you can find workarounds for noise reduction.
Especially for chroma noise reduction, you separate your video into a color signal and a brightness signal.
Use the blur sliders on the chroma signal and you have chroma noise reduction in Resolve lite

You can even set the amount of blur per color channel, so lot's of options for chroma noise reduction in the Lite version.