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 b

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.