For personal use as I enjoy the aesthetics of it. The more solid coloring helps highlight the brightness variations from changing and makes trends crystal clear.
Inspired by "Volume Based Coloured Bars" by KivancOzbilgic:
and by and by bars chart by taskman9:
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.