Been using Keyclick for years. I find that on a quiet MacBook keyboard, the auditory feedback helps me type with much better "flow". In a quiet environment, I'll even put on headphones for the purpose of using it without bothering others, if I have a lot of typing to do. On my desktop, I often use a mechanical keyboard which has a bit of sound of its own so it's not really an issue.
On my new MacBook Air 2020, I have found that Keyclick (and also KeyUp, see below) doesn't register sounds quickly enough to keep up with typing. Oddly, though, if you have GarageBand running, even just idle in the background, it keeps the "Core Audio" process more responsive, and Keyclick works as expected. That comes at a cost of higher processor usage, though, which you can verify in Activity Monitor.
Unfortunately, Keyclick is only very sporadically updated. The little user forum on the developer's website went dead a few years ago and he seldom if ever releases updates. I've been able to keep it working on Catalina and hopefully it'll continue to function under Big Sur.
I've found one other utility which gives nice typing sound feedback: KeyUp, which can be found here:
http://www.irradiatedsoftware.com/labs/ Its primary purpose seems to be to put a virtual keyboard on your screen (not entirely sure why) but that can easily be hidden. It's got a number of sound sets, including a few typewriter ones. The developer seems a bit more active than the Keyclick guy, fwiw.
