[syhol]

You start with the cleanest most minimal config you can get away with, but over the years you keep adding small additions and tweaks until it becomes a massive behemoth that only you will ever understand the reasoning behind.

[iainmerrick]

Right, and then when you don't work on it for 6 or 12 months, you come back and find that now you don't understand it either.

[latexr]

Part of doing it well is adding comments as you add options. When I used vim, every line or block in the config had an accompanying comment explaining what it did, except if the config’s name was so obvious that a comment would just repeat it.