Is a 5900X better? Yes, by quite a bit. Will you actually notice any difference in your gaming? Nope. Save your money. Take a trip or something instead.
"Take a Trip or something" seems like the best advice, barring other recommendations from the CDC!!!
The money is burning a hole in his pocket, but his malady is not nearly so bad as that of a millionaire I know who "had to have" a Falcon 2000 jet, and then decided to take his wife to Vancouver, BC in a whimsical junket so they could sit in a restaurant to dine on freshly-caught Alaskan crab, returning to Phoenix hours later. He also bought a $20,000 wrist-watch to wear, was approached by a woman who recognized the watch and its price-tag, and then he cringed at the type of people he was attracting. But -- he "had to have" that wrist-watch!!
On the matter of computer parts, I'm not moralizing. It's more rational than people who trade in last year's new car so they can buy the current make and model, eager to sweep more money out the door.
Personally, I have to balance my practical computer needs, which are extensive, against any desire to have the latest, greatest most demanding games and the hardware to play them. For me, it's also the issue of the time and effort spent in moving the OS from older to newer hardware, and tweaking it to resurrect total compatibility. In some cases, a person might find it more expedient to simply do a fresh OS install and build the software configurations from scratch.
My own biggest mistake? It's my "vaping-pen motherboard disaster" reaction. I could've repaired my "old" Z170 system for a mere $88 in shipping charges to RMA the dead motherboard to ASUS. Instead, my "stimulus" money grew wings as I went on a binge purchasing $1,000 in hardware. Thus, people told me I should've upgraded, even to last year's Comet Lake or to a Ryzen.
Is this a "pent-up demand" situation brought on by people "sheltering-in-place" to weather the current plague? I wouldn't know. In my personal case, I suspect as much. And it's harder to assess, given the fact that our members here are always eager to "try new things". It's a prevailing motivation on these forums. I could kick myself for the panic spending. But I'm going to take several months to deliberately plan and execute any upgrade to significantly-new hardware. . . . Even if it might have cost me less in hindsight than my repair project.