Would not be better to enable for all and let the problems happen with the unit itself on the specific platforms? At least then it will be tested and hopefully fixed.
But it is not a nice thing to hear that some unit that has been enabled for project X for half a decade turns out to not even work superficially. That makes platform status quite convoluted.
Note that this is not a general rule, it depends on the assessment of whoever did this. Resolver is a sensitive part, security wise, that might have factored in to it.
If you have tested it somewhat, just file a change request bug to enable it for the tested targets and packages.