"Titles such as Dr can mean that gender is not clear."
Well, quite! And sex can be left a mystery, too. It's one of the benefits, surely? People's gender is their own affair and there is no reason why everybody should be forcibly outed at work and made to sign up to one of 100 or so gender labels. If an individual wants to share that information, perhaps in order to request that colleagues use particular pronouns when talking about them, they are free to do so, but where is this need for compulsion coming from?
People change their minds and some people haven't given their gender much thought at all. It's hardly the job of employers to force consciousness raising on such a personal topic. It isn't acceptable when it's politics or sexual orientation or religious belief, so why is it suddenly fashionable for employers to make intrusive personal enquiries about gender identity? It verges on the prurient.
I love that acquiring the title of Reverend, Doctor, Professor etc recognises a status, calling or expertise without revealing an individual's sex, or their gender for that matter. Use initials for first names and you're free and clear of sexist assumptions.
Why do they think so many writers have historically published under initials and surname?