I've daily driven Linux for years, even on laptops. Yet they're always plugged in because I've yet to see Linux out perform battery life of native OS's. Well, except for very niche and pared down Linux's.

Rather it seems that as time goes on Linux just outgrows old devices entirely, again excluding very niche distros. Not that it makes them increasingly efficient.

Have you seen Linux getting more efficient over time? What's your use case?

I'm definitely not the one to ask, I use laptops as movable workstations, always plugged in.