Why is there a pronoun setting for users in CA?

Is it for demographic tracking purposes?
Or ideological reasons?
Or to be trendy?

Nah.

It's for language generation in the UI.  In other words, to make the in-app copy of CoachAccountable more personable and natural when talking about a given user in the 3rd person.

To be as non-invasive as possible, CA will, if it can, guess the user's preferred pronouns based on their first name and country, and set them accordingly when sufficiently certain.  (When a first name is too ambiguous, CA defaults this setting to "they".)

This can then be seen and updated in the Basics area for a given user manager pop-up, or on one's own My Account >> User Profile page.  If CA's guess was incorrect, you can set it right with 2 clicks.

If that's an unwelcome bit of UI for you...Well, sorry.  CA has had this in place since its initial launch in 2012, long before this (lamentably) became a contentious topic.

Then, as now, we're just out to make an elegant and personable system.