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The fact is that hardware has now out-paced software. A truly decent PC or Mac (solid design and solid components) should be more than ample to last the average consumer ~10 years. Yeah, this R&D Engineer said 10 years!
You used to have to upgrade every 2-3 years. Then every 4-5 years. Now, if you start with a good solid platform, you should be good for about 10 years. The hardware speeds are limited more by the laws of physics than process advances. We have graphics engines that deliver for ~$300 what Top of the line $1,800 GPU’s delivered just a year ago
Drop $2,000 today on a good design and you have something that should be around for a decade, if properly cared for. This is something that Apple does well. The asymmetric fan design delivers quiet yet ample cooling. Apple products just last longer.
But before that they need to release the large Thunderbolt 3 displays that can have one or two discrete video adapters built in and support them with Metal drivers: You buy a new Thunderbolt 3 display, add your own GeForce or ATi video adapters, connect it to your Mac Mini or MacBook Pro, and you have whatever graphics power you added to your new display.
They need to get this done and get on it now. Right now.