Johan,
Yes, users opting into the option with `-preview=noXlinker` will need to fully opt into it. So it will be best for them to just add `-preview=noXlinker` and other adjustments to their dmd.conf file.
The reason I chose not to implement `-Xcc` is because we have too many ways of doing the same thing. The code is becoming difficult to learn and maintain as we try to carry forward the design decisions of the past indefinitely. I'm sure you and others will disagree, but I think it is best to invest with the hope that someday we can delete legacy code, not continue to add to it.
Mike