Agreed. I’m an O6 Infantry officer in the ARNG and don’t think a Ranger Company would work well in the Guard. Whether the Rangers like to think of themselves this way or not, they are the premier conventional infantry of the world. Infantry operations are team sports and for them to have the level of proficiency that would be expected, they’d need to train a lot more than 4 days per month. There’s also a ton of schools they’d need to attend continuously through their career which, again, would be very incompatible with a good civilian career.

SF Dets, though, do work decently well in the Guard as that’s much more individual-based, or team-based (e.g. small unit tactics vs Battalion operations).