We're deploying from Stage to Prod via VSCode and package.xml. We're concerned of overwriting certain existing Profiles on Production. We haven't updated Stage from Prod in too long.
We still need to deploy those Profiles as they relate to the new fields and other metadata in our package.xml
If we use SFDX (we are thinking of retreating to ant migration for this) still, we need to be assured: A) that anything that doesn't exist in the Profile on Stage, does not remove it from Profile on Prod B) that Profiles in Prod will only receive the changes associated with fields in our package.xml
Please help, as I cannot find official documentation for this most important topic.