The battery lights display useful information by being visibly off. When you see 7 dots light up, you need to be able to see the 8th dark hole to know it's at

The battery lights display useful information by being visibly off. When you see 7 dots light up, you need to be able to see the 8th dark hole to know it's at 7/8 charge and not 7/7 or 7/10. Similarly for the charging indicator: when it's not charging, you want that to be obvious. Arguably, knowing that the laptop camera (or the wireless keyboard bluetooth pairing) is not active is not as useful information.