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Not to mention that the default compression methods used by handbrake are not DVD-compatible; your DVD authoring software (you do have that, right? There are a lot of them out there) will end up converting your video to MPEG2 for the DVD, after handbrake converted it to h.264 or h.265. That's one added step of video degradation you don't want.
Search for "DVD authoring MKV" and you'll find quite a number of packages out there.