It's helpful where people have first names that aren't gendered though. There's a Frankie on one team and I had no idea whether they were male or female until she put her pronouns on her sig.
Why does it matter what sex someone with whom you work is though?
Seriously.
If I'm in any doubt, I just use their name or "they". No big deal.
I care far more about them doing a good job.
My name isn't obviously female and frankly there was a noticeable shift in how people responded to me before and after they knew my sex.
I really resent the concept that by stating pronouns "gender identity" becomes important in the workplace. It isn't.
I don't want to bring my "whole self" to work, nor am I interested in anyone else doing so or being expected to validate another persons beliefs/ideology/politics etc.
I don't and won't put my pronouns in my work email because it signifies I believe something I don't (that you can change sex) and that it's remotely relevant to my or anyone else's performance in the workplace.
My experience is that it's so often driven by (predominately white male) Exec's and HR departments trying to be "relevant" and "inclusive" whilst simultaneously ignoring the far more significant lack of diversity/salary parity/seniority wrt to women and ethnicity within the workplace.
So hey - let's celebrate everyone having their pronouns on emails and our Stonewall credentials, but ignore the fact there is no BAME or female representation at a senior level.