Just like how family/walk-in doctors get paid in 15 minutes increments so they try to rush as many patient through the day since they get paid for 15 whether it was a 2min appt or not. Which is why you see walk-ins packed full of people with well over an hour times, because not every meeting is fast.

On the other hand, I assumed the specialist got paid for their individual services they provide (and the orignal doctor got rewarded for the referral), since that's what they get referred to do, a specialized service which can be rated. It's also why radiologists ($800k/yt) are the highest paid doctor-type, complicated stuff requires good pay and they negotiate these on a case-by-case basis.

Edit: I found a paper talking about capitation in Canada and it mentions that Ontario is the only pr]ovince doing it and not all GDPs opted-into it. This sounds interesting - if a bit trusting of the people reviewing "performance". But I support testing out new payment systems, the current one could use some optimisation no doubt.