Why aren't new vacuum tubes as good as old ones?

New production tubes that I can vouch for
1) EML.
2) Psvane, particularly their top level W.E. Replica series.
3) Shuguang, their treasure series.
4) Takatsuki,
These can compete with the best tubes of any era in my opinion.
There are some very good NOS tubes to be certain but there are lemons in that niche as well.
Charles,

Gary,
I've heard their 845 and it sounded better than NOS RCA 845 in a friend's SET amplifier. I use the Psvane 101D Hifi series tube in my preamplifier. People who've heard both say the W.E. 101D version is significantly superior ( and the Hifi version is very good!).I haven't heard their 300b but again it's said to be quite good.
Charles,