Probably the best example I can think of is Diane Duane reworking her Wizards series to make it modern-day, but there are others, including owners of a literary estate altering books left to them to make them compatible with current standards.
What do you think? Does it matter if it’s the original author or an inheritor?
I think authors revising their older works to make them more modern is a matter of personal choice and the author’s artistic vision. Some authors may feel that their older works are outdated or flawed, and want to improve them or adapt them to the current times…or they’ve grown out of racism, homophobia, and sexism. Other authors may feel that their older works are part of their history and identity, and want to preserve them as they are. As long as the authors are honest and respectful of their readers and their original intentions, I’m fine with it.
That said, both versions should be available.