The usual Uber/Lyft booking/pickup system doesn't scale well at airports where personal car pickup/dropoff is already a real mess in many cases. Some airports are trying to deal with this by moving ride-share to a different area (e.g. Central Parking in Boston) which is less convenient for passengers, especially those that don't know the airport well.

Usually I just take a taxi from the airport if there isn't a good transit option available. (Or book a car service in advance at my home airport.)