No, I think you are - perhaps deliberately - misunderstanding me.
If it were clear that you get a "rush of endorphins" after an unmedicated birth which you do not get if you use pain relief, and that that "rush of endorphins" is so amazing that it completely makes up for all the pain experienced in childbirth and then some, it should be possible to convince women of the benefits of unmedicated childbirth on that basis alone.
But we aren't being told to avoid epidurals so we can get that "rush of endorphins" at the end. The "rush of endorphins" is barely a footnote in the discourse on this subject.
We are being told to avoid epidurals because they supposedly interfere with our ability to give birth naturally, slow down labour and increase the risk of interventions such as assisted deliveries and emergency C-sections.
If you are going to advise women to do something excruciatingly painful without pain relief, on the basis that the highly effective pain relief that is available significantly increases the risk of negative outcomes, you need to have high quality, credible evidence to support those claims.
That evidence does not appear to exist.
Like I said. If women are choosing to labour without pain relief because they're chasing that high that definitely exists when you give birth without drugs and definitely doesn't exist when you give birth without it, fine. More power to them. But if they're choosing to labour without pain relief on the basis of scare stories which aren't supported by reliable data, that's not so great, is it?