Not really. Premier Pro doesn't scale well past 10 cores and still very much likes clock speed. Threadripper 3 in tests doesn't outperform Desperation Lake X enough to warrant the significant price jump. So if you're working solely with Premier Pro then Threadripper 3 might not be the best bang for buck.
Work with the full Adobe CC suite however, especially Dynamic Link, and then Threadripper comes into its own: Premiere may only use 10 cores, After Effects may only use 10 cores, when they can have 10 cores each and Threadripper still has a minimum of 4 left over.
And don't forget there's a big shift towards Davinci Resolve for video now, and that's a much more modern piece of software which Threadripper will eat alive.
It seems ~16, maybe 18. the 12 core 3900X is some way behind the 16 core + CPU's which in turn is faster than the much higher clocked 9900K, beyond that its just clock speed, the 4.9Ghz 10980XE tops the cart but only by 0.01, good luck running that at 4.9Ghz in the real world.

For Premiere Pro the best value is actually the 3950X.
PS: Davincy Resolve is awesome

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