It's official then I guess... Paul has completely lost the plot at this point. Don't get me wrong, it's a really solid chip, but the pricing (ESPECIALLY if you consider the entire platform, ala board+CPU+cooler) is absolutely freaking TERRIBLE!
If you're building a gaming rig, going with a Ryzen 5 3600 & B450 (to save as much as possible, but you could spring the +$20 for B550 if you wanted) saves you enough money to go up an entire GPU tier (meaning better gaming performance!!!), and if you're building it for ANYTHING else, a Ryzen 7 3700X machine absolutely roflstomps it AND is cheaper (cheaper board + free cooler).
The only situation where this i5K makes any sense is if you're building a flagship gaming rig w/ an RTX 2080 Ti (where there's no point to saving money on the CPU for a better GPU), but at that point, why the hell are you buying an i5? You're building a mondo expensive flagship machine with 8c/16t consoles imminent, put a damn i9 in there.
TL;DR - The only kinds of builds that would benefit from buying this chip are the same kinds of builds that no sane person would ever put an i5 in...