I know this is a very unpopular opinion, but I very much love my 6,1. Last summer OWC was offering a flash sale around the time 7,1 was announced so I managed to pick up a Apple certified refurbished unit at a very reasonable price, with 3 years of AppleCare. I've used every incarnation of Mac Pro. I manage a video team at a corporate level so I've got my hands on the 5,1 6,1, 7,1 and 1,1 iMac Pro frequently in my office.
Back in 2016/2017 I decided to sell my 5,1 at home and try a mobile setup with a fully spec'd MacBook Pro, eGPU and a 5k Ultrafine as my daily driver. After 2 keyboard failures I decided to pick up the trashcan last summer for freelance and work from home heavy lifting. It's become my daily driver.
My 12 core, D700, 64GB, 2TB Aura Pro X2 runs butter smooth and is very snappy for what I need. 4k/1080 video editing, graphic/web design, light 3d animation, occasional bootcamp gaming, web surfing and playing YouTube. I have mine hooked up to a Blackmagic Vega 56 eGPU to drive my Ultrafine at full resolution and one of my two 27" LED Cinema Displays. Honestly, I'm very happy with the performance and have never experienced any issues. It feels as snappy real world as my iMac Pro's at work. So far so good with the D700, but I figured the eGPU was taking a lot of the pressure off.
That said, the prices really need to drop unless you can find a killer deal.