This is accurate. The Sunni-Shia divide is something I think westerners struggle with understanding, likely because- and perhaps especially for Americans- Islam is a distant religion and the only analog they can come up is the Protestant Reformation, which for reasons that need not be said is not usefully similar. Your last sentence also helps explain why the current administration, assuming they understand and are aware of these distinctions in a way that actually informs policy, is giving so much deference to the Taliban right now.
I didn't mean to over-emphasise the Sunni/Shia divide. I've been told by moslem friends that most ordinary moslems regard all fellow moslems as brothers, regardless of their sect affiliation.
My point was that the Taliban have limited geographical ambitions; even within Afghanistan, the regions on the border with Iran (like Jalalabad) are not Taliban-friendly. In the north, the tajiks, turkmen and so on are likely to oppose the Taliban. They face a lot of internal opposition, even without the West interfering.
