After that whole search engine scandal with Kiwi Browser, a lot of people don't trust it anymore. I believe it also majorly lagged behind Chromium versions.
It got updated to newest Chromium version recently, the build process seems to be semi-automated now too.
Isn't it open source too?
Unfortunately it's a bit buggy on some of my devices.
Newest FF beta got unexplained speed bost and tablet UI, it's approaching irreplaceablity steadily for me, There's IceRaven FF fork which has enabled even more addons.