I want to be an Apple fan. I really do. But they are making it impossible for me nowadays.
I'm fine with a typical 4k display (or better). The panels of the better ones seem to come from LG anyway and are widely available on the market. I wonder if Apple would be selling a good quality 5k monitor with TB3, or if they go for a high-end 8k screen. Personally I'm not in the business for the highest end. LG has announced a bunch of TB3 screens, where the 4k 32" version would be sufficient for me. But LG lately has problems bringing their better screens in enough quantities to the market. Last years 32" 4k screen is still not widely available here in Germany.
8K would require new HDMI cables and ports, would it not? I'm pretty sure that many people are still stuck with legacy hardware in this regard.
Knowledge of the coming Mac Pro allows me to view this device with levity because I can view it as a herald of things to come in a more satisfying format; had I not known of the ‘imminent’ (end of 2018 or beginning of 2019) Mac Pro, I would have been utterly aghast at the idea of Apple pushing me towards the integrated solution.
I tend to cram my computers with cards (not graphics cards, but things like SDRs and FPGAs) but what really does it for me is having the monitor built-in: I'm used to multiple monitor desktops, and I like both screens to be absolutely identical make and model. That clearly isn't possible when you have an all-in-one computer with no available ‘identical’ screen.
Also, my computer belongs beneath my desk, and my monitors on top of it. It's just the preordained way. All else is heresy. ;)