Are centuries-old fatawa generally obsolete?

I looked at the PS in the question https://islam.stackexchange.com/q/55074/17163 , and it requested fatawa which are up to date. Modern society seems wildly different than what would have been conceivable centuries ago. Moreover, scholars' access to information was greatly limited by the lack of immediate communication. Thus, it seems plausible that with greater access to information, and in a vastly different (previously inconceivable) context, that scholars may have written different fatawa. **Question**: Are centuries-old fatawa generally obsolete?