Read Receipts are invasive, because they signal when I read it - which might well not be when I want to reply. I could read an email today and then decide I'll reply tomorrow or next Wednesday, because reasons; but the sender will see the read receipt and just assume I hate their guts for not replying immediately to the Most Important Person In The World (i.e. them).

So I turn them off as a matter of routine on all my accounts.