You are correct, in 2017~2018 era. and perhaps beginning of 2019 year as well, but not for 2020. CPU market has never been this volatile in recent years. If VEGA II delivers with reasonable price, then your view may hold true even in 2020 for some people. We shall see.
It’s really early.
People are losing their minds over a chip AMD released last week.
I think the 2019 Mac Pro will sell fine. Not off the wall, but it will be fine. For most users, it will give them the power they need. And Apple isn’t alone here, most of Apple’s competitors aren’t shipping Threadripper either.
If you must have the fastest and newest at all times, by all means buy a Threadripper. But I don’t think this really rises to a failure on Apple’s part. There are still going to be plenty of vendors selling plenty of Intel workstations. For now.
And whenever you buy a Mac Pro, or any workstation, there will always be something better right around the corner. That’s just how things go.
HP hasn’t shipped their new Intel workstations yet and I don’t see anyone ripping them apart for being behind. And just like Apple, HP will keep selling Intel workstations no problem.