Is there any particular reason why the Mahoosucs aren't part of the WMNF?

There are some debates as to which ranges can be included as part of the White Mountains; I've even seen some people argue that the Longfellow Mountains of Maine technically constitute a northern extension of the White Mountains, though this is controversial.

All of the classification systems I've come across, however, unanimously label the Mahoosucs as being part of the White Mountains. This makes me wonder why they aren't included in the WMNF; all of the other ranges that are deemed to be incontrovertibly part of the White Mountains are included in the forest.

A portion of the WMNF, the Caribou-Speckled Mountain Wilderness Area, already extends into Maine, so I wouldn't think it would be a state-related issue. I'm not sure if there is some obvious reason that I'm missing, or if it's just that nobody has ever sought about trying to make it part of the forest. Maybe including it within the forest could harm the range by increasing tourism?

I'm interested to see whether any of you have any thoughts on this matter.