Buzzwords are pretty viral via consultants, and so eventually leach into the corporate / common speech.

Because if you're not using the newest lingo, you might not be using the newest approaches, and might be falling behind! (gasp!)

Not to this Brit. 'Lessons' all the way, both in corporate speak and in my multi-decade involvement in building training and education systems. We did used to identify 'key learning points' which would summarise the main things a student was expected to take away from a course, but I never saw this abbreviated to 'learnings'.

In my corporate experience, the main thing about lessons was whether they were 'identified' or actually 'learned', e.g. following a corporate post-mortem of some cockup/fiasco/disaster.

Is it? As an Englishman, my instinctive tendency is to blame any corporate buzzword innovations on the US: but perhaps I'm wrong in this instance.