Excellent post @Delphinium20 you have explained linguistically what I was feeling instinctively.
It's not the same as changing name.
Pronouns are universal, and normal usage is sex-based. We are trained, from a young age, to use pronouns in this way. The mental load of changing that for one or two people is enormous. And very discriminatory, and I think could be seen as harassment if enforced, against anyone who is non neurotypical, disabled, or a non-native English speaker (or a child, who might be struggling to learn grammar rules in the first place).
Maybe as a society we'll eventually move towards non sex based neutral pronouns for everyone - 'they'. I believe some safeguarding will be lost this way, but still, maybe it'll happen. But individual pronouns for each individual person? Impossible. The mental load is too high and at that point you might as well use the person's name instead.
In the workplace, if every individual person had a different pronoun sending emails would soon a) take about 10 times as long and b) hugely affect productivity.
Also, given how easy it is to 'misgender' do we really think normal people will be going around reporting others - in McCarthyist fashion - for misgendering? I don't think it's likely.