I think thats more telling about what Apple is doing, not the customer base.
Currently, their laptops, especially the "pro" series is out of date. its not a terrible laptop by any stretch, but the components in it are now 3 generations old. Its not just pure horsepower that comes with newer generations of internals. It's more efficiency, better feature set, battery life improvements and expandibility. For users who prefer OSx, but need a computer that has some muscle behind it, and enough options of ports and configurations that it fits their work / business, 3-4 year old components, being sold at Today's prices is frustrating. hence the complaints that they haven't updated the rMBP lineup. These complaints are entirely justifiable.
and now that they are updating, and rumours are out (these are just discussions based on rumour / speculation at this point), there's serious concern that Apple is going to do the same thing they did with their other PC products. Remove features and functionality in order to be "thinner". They did it with the iMac, They've done it with the Mac Mini, they did it with the Mac Pro. So yes, there are people worried, and complaining that the so called "work horse" Macbook Pro is going to receive the same neutering that every other apple computer has received over the last revisions.
So while your post seems very antagonistic, and sounds like you think everyone should just shut up and swallow whatever Apple sells like good little robots, you have to understand that over the last couple Apple PC revisions, Apple has moved further away from the core group of people who used to buy their "Pro" devices, and have made them more geared at the average user, and not those looking for that work horse.
I think people would have less concerns / complaints if this wasn't the "MacBook Pro". But having that "Pro" in the title implies certain things to users. That the device will be usable in production workloads. be consistent in performance. Offer enough, and varied expand-ability to allow for multiple different workflows and usability. This is more than just a few USB-C ports and dongles. this is the capability of the hardware from natively being able to handle these different workloads, while also providing some ability to scale up (replaceable drives, memory, etc). If Apple goes down the route of further limiting the MacBook Pro's capability to make it thinner, then many of the complaints in this thread are 100% entirely valid, whether it applies to you or not. Many of these decisions that have been made in the last 5 years feel more like Apple is putting profit margins first, before trying to actually provide a top tier product.