You're downvoted because this was legitimately not a noun until the last 10-15 years, and it came from corporate/bizdev lingo not regular speech.

Lessons has been used since the 13th century.

It's amazing to think that the regular accepted noun sounds snooty to you.

The least snooty would be "knowledge", which has Anglo-Saxon Germanic roots, and is much older going back to the 12th century.

They definitely had the word well before the last 10-15 years.

It might have been spelled "learninges" or "lernynges".

This is why people have adopted corp speak. They're traumatized by words and need to replace them to help with their ptsd. In 10 years "learnings" will be replaced by something like "considerations" or "updates" when zoomer managers get to set the rules.

I've heard "findings" (ab)used as a synonym for this as well.