We are in the AI era, it doesn't change the fact that investing 1 hrs a month (or even a week) into a long-dead project in a language you no longer use is more investment than 0 hours for the rest of your life.

And yes, if your timeline as a dependency enjoyer is "is this project going to be maintained for 15 years" and you still assumed the answer is yes, it's kind of on you adding a dependency.