That's scares me cause I've seen that bit way too many times. There are huddled over the terminal in the evening as all managers leave "Oh look so and so is working so hard" and I am thinking "they are fixing the bug they put in just last week because they didn't bother testing it enough".
Tons of that. Each server was a literal copy of a previous one then modified to fit its new role. So we never got two servers that were the same. They'd have extra junk on them too.
Just basic docker use (or something similar) would have made a HUGE difference. Parts of the department were sent to training but it didn't happen because it would have made him less indispensable.
At one point someone higher up (but not high enough) asked how many servers we had in Amazon and the answer like 10x our physical set.
"And only one of you manages them?"
"On the side, we don't usually have to touch them."
"Then why does it take 4 people for the other servers?"
(Collectively) "Yeah. Why IS that?"
Change control was a big problem too. "Random" changes, things that didn't change at all (even when we could prove it), stuff like that causes SO MANY issues, basically all avoidable.