It's really about the correct tool - running a MBP at 100% 24/7 is just not what they are built to do, and they throttle severely (NB - the GPU being used at 100% at the same time contributes to the problem - the MBP design doesn't allow adequate cooling for that kind of sustained operation). That's part of why the cMP is still a useful tool - it can be run 24/7 - and the tcMP is not. I don't do any sort of video or graphics work, so can't comment on those, but for hardcore computing, Apple's lineup is a sad joke. And what frustrates so many is that it used to be at least competent.
The MBP is a bit tricky, though, as I think that has always been the case. So, I suppose it fits the newer 'Pro' designation better (as a marketing term) than the 'power user' or older 'quality of the device' designation of pro.
When you talk about the tcMP, is that based on a bad set of them, though, or universally? I was under the impression that they could take 24/7 serious use. I was under the impression the GPU failure thing was isolated, but maybe not. (I'm partly asking, as I'm waiting to see what Apple does with the Mini, but have been considering a base tcMP to get a headless machine that is quiet, but can also do some heavy crunching at times.)
However, iMacs are horribly designed hot boxes that cook their own screens (know from experience). ... Plus the aforementioned internal thermal issues and horrible air flow disqualify the iMac for me as a professional user.
I'm curious if you're talking about the regular iMacs, or are including the iMac Pro here. My understanding is that the iMac Pro does have an adequate cooling system.
I use this machine ~11 hours a day. 8 hours at work, several hours at home. It’s a MacBook Pro. Not sure how that isn’t “power” enough for you.
I think the confusion here comes down to what we mean by 'pro' and how it is being applied to products. A Pro designation used to typically mean a product was designed to withstand the rigors of professional use. That usually included some of the more extreme levels within the professions being covered.
For example, a professional handheld radio might differ in the ruggedness and water-resistant nature, but otherwise be a similar product to the non-pro version, because the 'professionals' it is intended for might be firefighters, etc.
The new marketing 'Pro' designation seems more targeted at someone like you... i.e.: I use my computer for my work... I'm a professional. This in contrast to a home user or hobbyist. But, in this sense, is a lawyer who bills $200 an hour using a Chromebook make it a pro computer?
In terms of Macs, professional used to refer to a quality of the machine, in context of creative/science professionals who did things like 3D animation, CAD, or some kind of heavier work, often involving graphics, video, etc. This meant that the machine could be expanded to support the kinds of hardware they used, as well as could handle the heavy CPU/GPU use, and support data IO speeds adequate to the job.
The laptop is a bit tricky here, as it is a compromise device. But, even there, I think it could be argued that Apple has been making trade-off decisions that aren't in favor of the more traditional definition of professional use. But in terms of desktops, they clearly made a swing away from that traditional definition.