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?
It’s fine, it’s not like you can’t get the older books with a little effort, and if the author wants to edit out something that age incredibly poorly in an otherwise fine book it’s for the best.