TL;DR: RTFM .
To be fair … quoting from /e/'s install instructions …
2. Make sure your computer has working
fastboot . Setup instructions can be found here.”
… where here is a page explicitly telling you to download adb and fastboot directly from Google.
One issue is Linux distributions offering seemingly outdated or otherwise unfit adb and fastboot commands.
Another issue is interested users not following written instructions telling them to “make sure” something works, and how exactly to achieve that if in doubt.
No act of moderation here will fix either issue.
Perhaps /e/'s install instructions could use some bold, signal red lettering in the right place instead.