i once worked with a clinical pipeline for epilepsy resections and was always amazed at how much tissue they'd remove.

they'd take extreme care to not remove anything that results in functional deficits, but would often resect near entire lobes.

i was shocked, but they said recovery was robust and that stopping disease progression was a much more important goal for long term wellbeing.

epilepsy can be progressive in intractable cases, the untreated endpoint is not a good one.