This is so true.

Even if you do design clean modular code and document it, you’re getting a question a year from now about how it works, or someone just duct tapes on top of it.

Really? The opposite is true for me.

Working with devs who aren’t familiar with design patterns, introducing design patterns by simply implementing them (in a new project) allows it easier for the devs to follow the implementation as examples, even though they aren’t necessarily familiar with the design pattern concepts.

At least they can observe the patterns and replicate the patterns elsewhere.