It is in accord with many of Photo Engineer's posts about film improvements.
As well as some other information I'm aware of concerning the approach taken when new or returning films were being developed - particularly the current Ektachrome.
The cost (and availability) of constituent ingredients is never unimportant. But availability is more likely to be a motivating factor for change in a competitive market where all producers have the same cost concerns.
An old story about RODINAL.
I don't really recall the magazine where and when I got it from, it was residing on my computer for ages and it looks rather old, here it is just for the fun of it, and I hope that there will be no copyright issues...
I found a 3rd bottle that I had bought with this lot that I forgot about. Someone had hand-written "New 2003" on it. The box looks the same approximate age as the others.