Note, I never had one and I really don't give a crap about what Apple does with its product line. But you can't deny that a lot of developers, particularly people who post on HN, have been predominantly MBP users for the past decade. And I can understand they care about connectivity[1] and battery life, and probably a lot less about the TouchBar.
Also you have a weird definition of "enthusiasts". The ones I know don't buy laptops, much less Apple computers.
[1] I have to admit, it's funny they still haven't understood that Apple never did.
I think though what many of us are complaining about is that "Pro" used to mean a machine that was targeted at us, i.e. Professionals. I guess now it just means "high end" but I remember a few years ago the Macbook Air was targeted at the "pretty things" market.
I remember about 5 years ago my brother a professional animator complaining about how Apple dumbed down Final Cut Pro X to the point it wasn't usable in his domain. These days his shop doesn't use Macs any more (typically a staple industry).
I've a friend too, who works in automotive industrial design who won't touch a mac because it just doesn't have the power he needs.
My sister is a professional photographer and up until a few months ago I wouldn't have hesitated to recommend her a MBP but in all conscience nowadays I can not. This dilemma actually forced me to look at Windows laptops and I'm amazed how much they've come along in the last while.
So it's not just "us" that feel abandoned by Apple, but professionals from other walks of life. It's fair enough, if its a segment that doesn't make as much money for Apple as it used to, and as a business they have to make business decisions.
As professionals we have to make these decisions too, and if Apple isn't the right tool for the job we need to source one that is. But, there was a few years there where it felt like Apple was our friend. They made some amazingly pro-friendly gear. It seems those days are waning, and that relationship is coming to an end, and some of us feel a little jilted.
On the one hand, we hope that this "friend" will hear our protests and change their ways but we know deep down that won't happen. On the other we have to give the best advice to our friends and acquaintances as to what is a good device for them. We, as in "those sorts of groups" have a responsibility to critically evaluate new hardware in this light.
Back to the issue, most complaints I've seen/heard are from actual professionals who wants - or needs - magsafe, more RAM, more ports, more storage, more speed, or better batterylife.
The new MBP doesn't give you much more than what you already have, and for people having machines starting to wear out, buy another of essentially the same thing feels like a bad deal.
For me personally the biggest issues are magsafe and no RAM upgrade beyond 16GB. I simply run out of RAM all the time, but I would prefer not having to switch to windows simply to get more than 16GB RAM, with all the pain that would entail. Magsafe because it have saved my machine several times while on the road or working from home with kids running around.
I'm actually in the camp which would prefer more battery but this seems more like the effects of forum echo chamber reinforcement than anything like a strong trend.
Sure, this is an edge case but that doesn't minimize my requirements for 32gb of ram. I'll be buying a new laptop next year to replace my 2015MBPr and it will definitely be one that has 32gb minimum. That is, at this point, more important by far than OSX to my workload.
If they were real enthusiasts, they would be for things like the Thunderbolt 3.0, the TPM, the touchbar, the excellent battery life and noise levels...
If they were real enthusiasts, they would know about USB-C more than "Hurr durr dongles"
My team is responsible for tech specs for a huge global enterprise. We A/B survey people for different hardware starting with our Windows 10 rollouts. Very, very few people, even tech people report any difference in satisfaction with PCs with 8GB vs 16GB or more, price optimized i5 vs fast i7, etc.
The three things that most affect satisfaction are SSD, not telling people what the specs are, and giving them Macs.
Normal people give no shits about 95% of the handwringing complaints.