Dupont Defender films

[sun of sand]

you may know already but there is a box of Ivora up on Ebay
52/3 is about 2 decades too old to even try IMO but

[sun of sand]

And what about Azo? It's been recreated in Lodima and others wish it were more like Industro
Panatomic-X? You saying you wouldn't like that film brought back? Lasts forever with no base fogging and great tonality.
Super-XX Versapan
Verichrome I hear all the time
Velour Black
Ektalure
I like very warm variable contrast Portralure, too
all the different paper surfaces
There were lots of great/unique films and papers

I don't see anything wrong with it especially if your efforts are towards photography and not just testing testing testing
Maybe by trying some of the forgottens you learn about some currently available that recreates or betters it
Maybe you rediscover something and buy up all you can get before anyone else finds out

I think before the net took hold of all the old paper that had been thrown away with most everyone believing it no longer any good
Now people try to sell it for more than it's worth because people have reported success