For me it was reverse. When I was a junior I was reviewing PRs from the seniors and it couldn’t have possibly been tested to work.

The seniors were super lazy and around half the PRs would have broken production.

Seniority often comes from years of work and not knowledge.

Better explanation of raid 5:

You have 5GB of data and 5 disks. You split your data into 4 parts and split one on each disk. Then disk 5 remembers if there is an odd or even number of 1s on the other disks. So whichever disk fails you can count if it was odd or even. So you loose 1 disk but keep full capacity of the other disks. No doubling like suggested before

As someone who does AI for a living: GPU+docker is easy and reliable. Especially if you compare it to VMs.