Here is the problem with these policies. What happens when just 1 person or 2 people have key knowledge? My company has/had (the people I know with it left) th

Here is the problem with these policies. What happens when just 1 person or 2 people have key knowledge? My company has/had (the people I know with it left) this problem. Things hinged on one person and a team of effectively 1 or even 2 can never go on vacation. Now, obviously this should be considered a problem too but other problems can make the 2/3 part unworkable.