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Replying to this thread, as it was the first one I came about in my search, about this topic. But I know it's always been one of the useful features we wished we had.

But on today's Blight Client...

No, the history shows the last changes to those was 2005.

I can confirm the limit is:

Formulas: 1000
Techniques: 1000
Spells: 250 (was upped from 200 to 250 on Delta 269 (Spring 2015).

There is no max total of the combined three, it's per container....