Apple laptops are incredibly good. But I did notice, switching to a 2012 temporarily, that I only missed like... half a dozen things. It was half the speed, twice the mass, but it got the job done shockingly well. I hated the old hinge trackpad, and the keys weren't to my liking. A few apps (mostly iPad ports) had typography that was hard to read on a non-Retina display. I switched back to the 2018 and yes it was a huge relief, but I could have switched back to my 2018 model 3 or 4 days ago and that says something.