I really respect that EA are working to bring this feature to the Sims.
This is not a feature I would personally use in CAS. As I have always used the same, self-insert Sim , and that's it. A single character I then use to try and "complete" the game.
However, everyone should be able to do the same thing that I do, and that includes being able to use their preferred pronouns. Representation is so important. And I have a lot of respect for the development team working to implement a feature I would never use, because of the inter-social and personal impact it can have on all players, not just those who would actively choose pronouns. I'll say it again, representation matters.
Language support is something I feel that can be covered pretty well with the "Custom Pronouns" field shown in the Inside EA Twitch stream. How and what are "default" pronouns could have been considered an issue, but I think this was addressed neatly by having the players insert their Sims name, and then choosing the pronouns in a single step. Regarding non-he/she pronouns, I consider the gender-neutral "they" to be a great option. I agree that the challenge will be finding a common-use equal in languages that don't have an official gender neutral equivalent, but by having the "Custom" pronoun option for those who would like to set their choice of pronouns, EA have allowed for a massive margin of freedom.
Pronoun implementation been very considerately done so far, and long may it continue.
