an array of ports, many of which I would rarely or never use.
The real kicker for me is future proofing. A little TB2 dock gave new (peripheral) life to my 2011 MBP via its sole TB1 port. USB3.0, eSATA, and an additional FW800. And I could daisy chain another TB1/2 device onto that, if I needed to. This means I can reasonably use that machine to e.g. record footage from a bunch of security cameras, run an iTunes library for AppleTVs, etc using reasonably modern mass storage devices at acceptable speeds. The USB2 ports on that laptop are essentially useless for anything but a mouse or printer now.
I also don't need to over-provision a machine on the off-chance I need something more - my 2018 Mini has no dGPU and I didn't upgrade to 10GbE. I don't know that I'm likely to need 10GbE in the time I use it, but it's an option, if I decide to repurpose it as a dev/build server when I replace it with a newer workstation in a couple of years. Same goes for a GPU. Or a SAS controller. Or any number of other devices that requires / provides high I/O.
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Apple would make a macOS laptop capable of running Windows.
Just like they do today.
The market for Mac gaming is so small that the machine would effectively need to include Windows out of the box to be relevant, and then what's the point?
What I'd like for trading is screen real-estate.
A 2018 MBP13 will drive 2x 4K displays, a MBP15 will drive 4x 4K or 2x5K, and by using e.g. a TB3 to dual DP adapter, you can run pairs of displays from a single TB3/USB-C port. So you'd still have 2 ports spare even with 4 4K displays.
If that isn't enough, plug an eGPU into one of the spare TB3 ports (with a decent one it will power the laptop so you'd still have one spare), and attach more screens to
that.
If you get screens with native USB-C/TB3, they'll likely include a USB hub on the back of the display too. Or you could get an adapter to break out multiple USB ports from the fourth TB3 port. Either a regular USB-C hub (which means it'll at best share 10Gb/s between the ports) or There's a StarTech one that uses TB3 upstream, and breaks it out into multiple 10 and 5 Gbps USB ports.
Your use case is exactly where TB3 shines. You want
lots of displays but you also want a laptop. No laptop on earth has enough GPU power or ports built in to match a Mac Pro. It would be as thick as a Mac mini and still melt.