I have an earlier post where I asked how I could have dt import only the metadata (tags, star ratings, etc.) and not the LR developing steps since dt doesn’t do a good job with them. No one knew a way to do that. The suggestion was to go through all 120k or so images after importing and one by one manually remove the dt development steps that came from LR. 
If dt did a good job with the LR development stuff that would be great, but since it doesn’t it would probably be better to have an option to tell dt to only import the metadata.
Importing Lightroom XMP sidecars
https://discuss.pixls.us/t/importing-lightroom-xmp-sidecars/20668