I cannot help with your actual but this is giving me mild ptsd flashbacks to everyone on hn/slashdot constantly repeating how simple and perfect unix security is, just use user accounts!
As if the most valuable thing on my pc was running a program on the gpu or the printer as opposed to my email account.
On unix your email account is part of the filesystem.
No need to go back to the Slashdot days. Look no further than 2 days ago to find someone arguing the kernel is uniquely important (here for reliability): https://news.ycombinator.com/item?id=49181366