Disagree with the TR 2920X recommendations for a system that is PRIMARILY used for gaming. If the OP's priority was video editing and encoding, I would recommend a TR, but the 1950X rather than the 2920X. It's cheaper, and will crush it in any core heavy workload like video encoding. 16 slightly slower cores >>> 12 slightly faster cores for MT throughput. The 9900K actually holds its own in terms of productivity vs the 2920X, see here for Premiere Pro performance, it actually outperforms the 10C / 12C SKL-X and TR platforms:
https://www.pugetsystems.com/labs/a...2018-Core-i7-9700K-i9-9900K-Performance-1254/
However, all of the above is rather moot since the OP has clearly nominated gaming as the primary use of the machine, and I think a 2920X wouldn't be the best choice for that. In fact, it doesn't even outperform mainstream CPUs that cost 1/3 the price, and the 9900K crushes it in any CPU bound gaming scenario, for a lower price.
The main reason I disagree with the 2920X recommendations for a gaming focused PC is that it is already a bottleneck for current top end GPUs like the 2080 Ti, even at 1440P. Compared to the 9900K, the difference in CPU bound AAA games like BF:V is about 35% when it comes to the all important min fps, or 1% lows:
https://www.techspot.com/review/1754-battlefield-5-cpu-multiplayer-bench
Generally, in a gaming system, the GPU is upgraded far more often than a CPU. If a 2920X is already a bottleneck TODAY, how will it fare with future GPUs? The bottlenecks are only going to get worse. You'll be forced to upgrade your $650 CPU in a year just to avoid seriously limiting any next gen GPU.
Threadripper is not, and never will be, the optimal platform for a GAMING focused build. It costs more, especially considering platform costs, and is slower than cheaper, mainstream class CPUs. Going by the OP's use case, I agree with the earlier recommendations of the 9900K. It is clearly the best CPU for gaming while still having good multi-threading performance. It offers the ideal balance in this regard.
TR does offers higher pure MT throughput, but not by enough to sway my recommendation of the 9900K due to the deficit in pure gaming performance, and the fact that the 9900K is better able to leverage current high end GPUs (and future GPUs) as well as 144Hz gaming panels (assuming the OP owns one, if not, I would highly recommend that upgrade! Once you go 144Hz for gaming you will never go back to 60Hz, the difference in fluidity is immense)