> The browser engine should become as the Linux Kernel: one engine and different distros.

Try spending a month with a BSD - personally, I recommend OpenBSD, or (yes) macOS. Alternatively, try ZFS where you've previously used mdadm+lvm+luks+etc.

The difference is like sitting in a chair that has all of its screws tightened. You only notice how bad was your previous chair once you feel there's no wobbling.