I'd not call per edit notifications infeasible, but without careful rollups they would be spammy. The issue I have with them is they would not be very useful or motivating as raw notifications from a naive implementation except to very new or casual editors.
Noticing that an article I improved got more popular or that a topic I've been interested enough in to contribute to has been mentioned in the media and suddenly spiked would be great notifications, but without a lot of developer work hints at those would get drowned out by background noise of "Already popular/controversial article you corrected a typo in once has had another 1000 edits".
Rate of change notifications would be exciting but very hard to provide. Counters would reasonably easy to provide but noise to most editors.
I like the "people from 5 continents have read the article you created/edited". It would come at a reasonable volume for most editor usage patterns, and could happily be processed offline once per day as it is purely intended as positive reinforcement. There is no response required so it need not have a realtime feel.
"People from 50 countries have read the article you created/edited" falls in the same bucket.