This war is going to be bloody and brutal.
This is an ethnic war at its roots, either Pakistan comes out victorious or (god-forbid) it breaks.
The Afghan Pashtun fascists have tons of supporters amongst the tribal belt and Pashtun nationalist areas who will symapthise and facilitiate them, as it escalates they'll do more bloody attacks and Pakistan will be forced to do the same. It will have no choice but to clear regions, exacuations, aerial strikes.
This is going to be 2010s level, or worse.
The urban dwelling Urduified weirdos will sit in their air conditioned rooms doing cringey analysis but at its roots this is a violent Pashtun Tribalist insurgency. They don't realise the level of ethnic fascism and sheer extreme racism in these regions, they'll instead blame it all on Pakistan. Or pretend the country is fine and not significiantly being undermined by constant Pashtun tribal violence and entitlement.