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?
Depends on the circumstances.
The book “Are you there God? It’s me, Margaret” had references to “sanity belts” for your period, which just confuses younger readers! Those haven’t been used in decades! So that’s fine.
But adding cell phones to “The Baby Sitters Club” is silly. Especially since it would’ve made it unnecessary to gather at Claudia’s house to dole out babysitting jobs!