Absolutely this. I'm typing this on a 2012 MBP and it has had 6 hard drive flex cable replacements by the Apple Store over 3 years, each time requiring a week of downtime. On the last service they replaced the entire motherboard, because they thought it can't possibly the flex cable if they've replaced it six times, but it's already starting to show the symptoms that it might need another replacement soon...

I love my 2012 MBP, but ultimately it's been so unreliable (and I can't stand the new butterfly keyboards) that it pushed me into buying a Windows laptop. I still use the MBP quite regularly when it's working though.