I had Ubuntu 20.04 LTS on a Dell Inspiron 3137. I ran apt-get update and it crashed and would not boot. I was preparing to lend the laptop out to family so I had to put Windows back on it. It happens. Your personal experience is not everyone's experience.
I would be intrigued to know what happened with this one.
Across well over a decade of using Apt on Debian, Ubuntu & Mint, the amount of times I have seen Apt crash, is never. By contrast I have seen Apt tasks fail leaving packages partially installed. If relevant, it may seem a trivial, semantic difference, but I think it is a little more important than that.
Following the typical Microsoft paradigm of 'just reboot and hope for the best' will rarely result in the desired outcome, and in the case of something like grub could well end up with a system that will not boot.
For me a key difference in this case, is I have never encountered an unbootable Linux system (outside of hardware issues), that I could not fix with some basic tools. I can't say the same of Microsoft products (Personally, I don't consider a fresh install a fix :) ).
I also would love to know more about this. The thing I do is wait for LTS version 20.04.1 or 20.04.2 before installing so all the kinks will be ironed out.