Historically, many SE tags have been inspired from Monero source code (see monero-wallet-cli, monero-wallet-gui, txpool and other examples).
I followed the conversation related to this pull request on Reddit and similarly would like to rename mixin to ring size ring-size on stack exchange.
The pull request referenced above only encompasses a visual change in the GUI aimed at making Monero terminology easier to understand for those that may not understand it.
Before proposing a more drastic pull request (removing mixin from all Monero source code) why not test ring-size on Stack Exchange first to see how it is received.
I created a ring-size synonym for mixin. Going forward either tag can be used. I wont merge the tags until we have reached broad consensus, but if ring-size grows in popularity here that could be a signal to Monero developers that a more drastic pull request to remove "mixin" from the codebase would be well received.
Any thoughts on this?