It needs an option to amplify the typing noises to "I work with developers who insist mechanical keyboards are better" levels.
There are now quiet Cherry MX switches, dampened in both directions of travel: https://www.cherrymx.de/en/mx-original/mx-silent-red.html They're no louder than a regular membrane keyboard, and much quieter than just using O-rings.
Honestly the biggest source of noise for basically all mechanical keys except buckling spring or cherry-blue style keys is the noise of the keycap or key stem hitting the bottom and subsequently the top of travel. Half of that is fixable with o-rings but that still leaves the noise at the top of travel which doesn't currently have any solutions as far as I know.