In startup investing there are a bunch of great rules of thumb. The problem? There are almost always a few great counter-examples. See e.g. Kjetil Holmefjord’s There Are No Rules.
In a business where one exception to the rule can make all the difference, it makes it very dangerous to blindly follow ‘the rules’.
The way to deal with that? Understand why the rules are there, but stay curious and open-minded so you know when to break them. Evaluate each startup individually. Keep working.