I have no problem with removing stuff like "Dear Sirs" where the change makes no difference. However when I was in private practice I remember writing a piece of advice which turned on whether the use of the word "they" in a contract referred to the obligation of one particular party, or multiple parties. The use of a plural pronoun solely to avoid gendered language isn't just a simple find and replace, it can change the meaning of a clause.
As far as I remember it was along the lines of "The Parties agree that Person A will do xyz, and they agree to do pay ££ to third party C." Person A claimed that the use of a plural pronoun meant it was obviously referring to all the parties and they all had to bear the cost of the payment equally. Whereas one of the other parties claimed that "they" referred to Person A who needed to pay the amount in full on their own, and the reason it was a plural was because Person A was female and "they" was used instead of "he" to maintain gender neutral language.
We charged quite a bit for that advice and patted ourselves on the back that it wasn't our drafting!!!