I reacted badly when I see people giving what is, in my extensive personal experience, bad and dangerous advice that will lead to significant data loss.

It's as if I saw someone advising DIY facial piercing with a nailgun. I didn't stop to consider any motivation; my reaction is an immediate NO DON'T DO THAT!

More than interesting though, I will vouch for many of the points they presented in practice. Spreading partitions and taking advantage of the flexibility of Linux with how and where they are mounted has been a part of best practices for decades now. Many cloud-based solutions for Linux workstations I've used take full advantage of this for easier management of space (i.e. volume expansion) as well as security considerations, to say nothing of keeping your /var/log separate to avoid running out of space because you turned on verbose mode for something.