What on earth are you talking about. This is a completely & totally nonsensical comment.
What is the question of the thread?
2019 Mac Pro worth it for 5+ years of use? i.e. Can I use this in 2024?
I am sure it can be used, and possibly still productive in 2024 - I kept a PowerMac G5 going for a very long time - that said, it won't be all that productive in 2024 compared to what will also be available for purchase in Dec 2019.
PCIe 3.0 - Look at the threads on this forum. How many are about how to get today's tech working on their obsolete and obsolescent Mac Pros. The 7,1 owners will be doing this on day 1, when they aren't trying to convince themselves that much faster throughput isn't really all that important.
You can have PCIe 4.0 today with an AMD solution; 2020 for an Intel solution. PCIe 5.0 will arrive in 2021, just in time for the AM5 and TR5 sockets. Intel will have it available for server products in 2021, and probably in consumer level computers by 2022, assuming no more delays.
GCN video architecture - Polaris is 2 generations back, Vega is 1 generation back. The GCN architecture is AMD's past - RDNA is their current video architecture - will there be an MPX version of the RX 5700, RX 5700XT, or a big Navi card (due 1st half 2020). Based on past performance, do you think Apple will deliver?
28 core single CPU max in a 64 core single CPU max world. Flint Ironstag mentioned the socket - that is yet another plus for an EYPC or Threadripper (or even Ryzen 9) workstation. The current sockets will work through Zen 3. Oh, and AMD has a dual core EYPC solution also. Then there is the cost differential just in CPUs (and electricity).
Price/Performance ratio will be a joke from day 1 and it will get worse over time. Apple should have jumped over to AMD for CPUs. Ryzen on the low end (Mac mini/iMac), Threadripper on the high end (iMac Pro/Mac Pro).
As I have said before, the 7,1 would have been a great workstation in 2016. But in 2019, nope.