Earlier quoted context omitted.
I see no reason why any of those people benefit from the slightly thinner form of the new mbp than they would benefit from better battery life. Everyone wants batteries that last longer. How often did you look at your last generation mbp and wish it was thinner?
These people are lugging their laptop around all day, from meeting to meeting, or airport to airport. If you can keep battery life constant at ca. 10 hours, which covers an extended work day, then beyond that most people would prefer to have lighter/slimmer/cooler (less hot) devices than one that runs for 20 hours.
At least give people a choice. The 17" used to be fantastic as well, and I still miss it. It was big and bulky enough that causal users didn't want it and so Apple didn't have to try to appease them with it as much.
It'd be great if they licensed MacOS again if they're going to give up on the higher end as we've seen with the Mac Pro 0-upgrades-in-4-years zero-commitment-to-the-platform approach they've taken, as we've seen with killing Xserve, with the dual-core-only Mac minis after the 2012 model, with iMacs using all laptop parts...
They message they send is clear: we make computers to do Facebook and some Excel on, not for making movies (FinalCut Pro X dropping tons of pro features), not for photographers (Aperture is discontinued), not for DJs (no more FireWire and 100% USB-C), not for programmers or hacker types (check how old their versions of unix tools are, dtrace locked out with rootless AKA SIP, non-upgradable/repairable hardware, Mac App Store limitations). All the reasons macs sold so well with pros before are basically nonexistent in 2017, and I predict that they'll slowly fade out of the pro scenes. At some point, consumers will notice ("why doesn't every major DJ have the glowing Apple logo on stage anymore???") and they will stop being cool.
I'm pretty convinced that all it would take to usurp Apple is a really solid design like an old IBM or a sturdy Dell with a touchpad that doesn't register your palm half the time, and a chassis that doesn't droop a few mm on one side when you pick it near the corner. Sadly, even today, there are not many options for laptops that don't feel like complete crap compared to any MacBook.