I'm talking about forcing it in when it hurts specifically.

It occurs to me that I may have accidentally answered myself at the end, when I referred to the concept of union vs. intersection. When you bring in helpful angles on your current paradigm from light cast by other paradigms, that's helpful. You're expanding your working set of options.

But when you get a bit of a good taste of those other paradigms, and then declare this is always the right way to do it, it may feel like you're expanding your paradigms, but now you're not. When you force sum types into a language that doesn't support them because they're just always the right answer, when you force lots of maps & filters in a language that can't do fusion and function calls are kind of expensive, when you force an algorithm in that depends on laziness to work, and so on, you are no longer working in a sort of union of paradigms. You're working in the intersection.

And that intersection sucks. A worst-of-both-worlds situation for sure.

You can tell, by the way people trying this are constantly screaming in pain about it.

When it hurts... stop.