I believe a lot has changed.

People are more interested in having good lights. And people who had no lights now want lights.

More good lights are on the market. I think the quality-to-price ratio is still climbing. Energy efficiency is still improving. Battery life isn't improving much but with improved energy efficiency, you get better battery life.

I imagine some take advantage of smart charging which was less common five years ago.

Mini USB gave way to micro USB which is giving way to USB-C.