Right, which is why the Pixel still charges slow af(25W). It’s really because it’s a single cell battery, the phones with really high charge speeds are multi cell arrays. Each cell can be individually charged at similar wattage to the pixel but with a much smaller cell size it appears to charge faster. I think the OnePlus is the one that is advertised to charge ridiculously fast, iirc it is a 4 cell array, which is why it can charge at 100W (25W per cell). Technically the same speed as the pixel but you’re simply charging 4 smaller batteries at once.

What’s wrong with your P6? My P6 Pro is almost 2 years old and it’s still working great.