I understand why you'd want to wring every last efficiency out of your computer, but I run Slack, Spotify, and many windows of VS Code on my bottom of the line

I understand why you'd want to wring every last efficiency out of your computer, but I run Slack, Spotify, and many windows of VS Code on my bottom of the line MacBook all day, frequently on battery power, and don't have a problem. What's the big deal?