Crazy that some programs minimize PGY2/resident exposure to the highest acuity/volume for acute stroke, but I've heard of a few other big programs doing this too. Would not recommend any program that does this regardless of prestige/reputation. You have to cover stroke call in many non-academic jobs, and having to do a stroke fellowship to feel comfortable taking this call really limits what else you'll be able to do like EEG/EMG/movement/botox etc.
My metric would be simpler if you can just ask the residents, especially if you care about stroke. Approximate thrombectomies each one orders per month/per call night, # tPA per month/per call night, %tPA overall for stroke alerts. My residency was about 1 thrombectomy per call day/night, 1-2 tPA per night, 20% overall tPA rate at our hospital, and like most places about half the consults were stroke, with 60-70% of those being acute questions. Some places I interviewed for residency tPA'd once a month or less- not the best training.