I don't think this new MacPro is expensive. While its 3K costlier than a similar performing Studio, one could argue that the Studio is a loss leader. But the extra cost is 10% more than the intel MacPro's entry level price, and that was four years ago. And that machine needed upgrading, but for lots of types of work, would be much slower than this base level MacPro.
As far as those who have PCIe GPU cards - they are sunk costs. Don't cry about spilt milk. Them working on M architecture was always a dream.
But ... if only they'd made the CPU upgradeable. They'd have sold a tonne of them actually ... to even enthusiasts. But without CPU upgradability, the machine is not even an echo of the past. And Apple could have done that fairly easily IMO, considering the time they have had to do so.
And there is a major negative about Apple. Namely value, and their desire to "own" their customers.
Also Apple carries on about sustainability and recycling and no chemicals and solar powered factories. But their premier product isn't upgradeable. That is not a sustainable practice. Its planned obsolescence.
If people laugh at the expense and non upgradability of the premier Apple product, then that filters across all Apple products. When people get embarrassed to buy a high end iPhone because its ludicrously expensive, then maybe the Apple pack of cards business model will start to wobble?
I've liked the ease of Apple, but while system 8.5 was magnificent except for some crashes, and then system X was stable, life was good. Jobs had turned the company, he had a vision, and it looked like Apple would survive. Intuitive, easy to use, and even fun! You paid a bit more, but the quality was great, and it was so natural to use. But now, OS changes make me have to re learn, and every update, I am nervous. The Mac OS keeps getting more difficult. I've found it easier to use Windows in some cases, because I know where to go to install something - the OS behaves much the same as it has for years. But Apple's freaking OS keeps re-inventing the wheel, and its no longer intuitive. Docks come and go, windows for apps come and then go, the icon driven System Preferences is gone replaced by a noddy incoherent list of cobbled together text based items that look like a children's playbook or maybe a failed 1997 unix GUI interface taken from a company that never made it.
I can buy a PC that will give me all the software I need (Apple often doesn't such as with Sketchup) and that PC will be upgradeable and low cost, and I can buy a smart phone for half the price of an Apple phone and it will take better pictures, and I can buy a notebook for a fraction of the price and it can survive a coffee spill if I buy one with a spill proof keyboard - and then I'l be free of the Apple eco system that wants to totally own every device I want to add. Well maybe its best to be free of the whole deal. Shame my wife loves her iPad so much ... and now my 2017 MacBook Pro cannot even run the latest OS. While a 2017 Intel notebook can run Win 11 no probs, after easily upgrading the RAM simms. And since Apple replaced the keyboard for free - after me kicking up a stink - then they had to replace the screen. Then the motherboard for a battery (how crazy is it to replace a motherboard for a battery)? And now the MacBook Pro freezes every now and then. Meanwhile my 5,1 keeps on keeping on and has been bulletproof.