Yes but now you’re talking about a $4-8k computer. My point was that if your budget is $2.5k Apple already has plenty of mac’s In that price range. Apple is not going to create a Mac Pro with a 10-core processor, terabytes of SSD storage and 64gb RAM for anything under $4k. You’re hoping for Apple to build you something that’s not in your price range. Your options are the 2018 mini or 2019 iMac. Both are more than capable of handling many VI’s at once. If you’re a film composer and literally need hundreds of VI’s than you need a larger budget... $2.5k isn’t enough
It's not just about price range it's about functionality.
An iMac however powerful it may be isn't suitable for making music projects long term as the internal drive is sealed and so irreplaceable as is the screen and there's no way to upscale it in future should your needs change or easily repair them when they develop a fault.
The same applies to the Mac Mini. I don't mind paying a bit of a premium (you always have for Apple stuff), but I need the functionality I get from my current Mac Pro, which has allowed me to easily replace hard drives, increase RAM, add extra ports and upgrade my graphics via PCIe expansion slots - all of which I have done and none of which is possible on the 2013 trashcan Mac Pro or the new Mac Mini - that's why they are unsuitable as replacements and that's why the tMac Pro bombed.
Apple could easily introduce an entry level modular Mac Pro tower with lower spec than Xeons that would still meet the demands of many professionals and power users. Call it a Mac Pro lite or something.
The CPU isn't the only thing that matters to pros and power users. Like you said the CPU in an iMac would cope very well with demands of running many VI's, where it fails is it cannot offer the flexibility to tailor it to meet your requirements and to be able to quickly fix the components that fail - the classic Mac Pro did.
Apple took this functionality away and have paid the price with plummeting sales ever since.
If Apple announced a modular Mac Pro with space for 4 internal sata 3 drives, 4 PCIe slots and a 6 core 8th generation i7 processor for £1995 it would fly off the shelves. There aren't many out there who need PCIe based SSD's, SATA would I'm sure be fine for 95% of users.
Dell offer such a system for £1199.00 so it's easily done and that's allowing Apple an £800.00 premium to pay for their design improvements and profit margin.
They can still offer Xeon based solutions at the higher end for those who need that power of which I'm sure many do and that's fine, but for the rest who (like me) already have a nice 32" 4K screen and just want a more modern Mac to connect it to and the ability to transfer my existing storage to, the specs described above would easily meet the needs of many.
It wouldn't 'cannibalise' sales or any of that nonsense, it'd simply make many long term Apple users like me happy and we'd be parting with our money instead of keeping it in our pockets.
My decade old Mac Pro has more functionality and flexibility than anything that Apple have introduced since.