Flash may be at EOL, but there are surely millions of computers out there that
are still using it. One example of software used decades after its EOL is
Windows XP, but there are many others.

These older setups may encounter problems even today, and there are surely
people on SU that have experience with Flash and can answer some questions
(I'm one). There exists also much documentation concerning Flash to be found on
the internet, and it may stay there (almost) forever.

So I suggest to update the tags, but to let such posts through without closure.
At worst, they would get no answers.