Some people like to strike keys like a f-ing woodpecker whose mother was personally insulted by this particular keyboard. I had a colleague who was louder with a membrane keyboard than me with a Model M.

There are regular switches, which are kinda noisy, there are clicky switches, which are loud as fuck.

But there are silent switches, and there are strategies to silent them even more (Bandaid mods, o-rings, stab lubrication etc). My work keyboard with Boba U4 switches and the aforementioned mods is well within the noise floor of an open-space. It's not "silent" as in "completely inaudible in a controlled environment", but it is no louder than a laptop keyboard (and with a deeper, softer, less jarring sound).