Jul (they/she)

Because the random alterations create variations that allow survival of the species, not the individual, in changing conditions. For an example of what happens without that, just look at bananas. Without any evolution through DNA alteration during procreation, a single disease van wipe them out across the globe. Happened once and the current strain is being wiped out by disease, though more slowly due to human intervention, as we speak.

It’s nice to have a GUI for those things sometimes rather than a command line for everything. If you’re doing things right, your daily login shouldn’t have access to modify system settings or read sensitive logs. But troubleshooting requires that often and ls, vim, cat, tail, etc., can become cumbersome compared to a GUI file manager and proper GUI text editor like Kate or Gedit.

That future might not be far off considering what Trump did today. Balance of power is seriously about to shift.

If it’s POSIX compliant then it will work on all versions of Linux/Unix. Otherwise it depends on specific implementations that have branched for decades.