Mark Dain
There's a variety of things it could be. Safari had trouble with t.co links some time ago which was due to HTTP/2. Sublevel has a number of fairly cutting edge technologies in the stack; HSTS, IPv6, New cipher suites and so on... Any one of these could cause issues. To say Apple can't get "anything" right because of a single issue is honestly kinda childish, especially when used to criticize APNS, which is an exceptionally reliable tool. It's never failed for me. Name a single company who makes software more reliable than Apple.