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It's effectively the same as saying "improvement aggregation"No, it's not (I also assume you meant "improvement aggravation").
First, pragmatically, as it is at the monent:
(1) "verschlimmbesserung" IS a word in German, and is in use, people understand it, use it to express their update pain, etc. "improvement aggravation" on the other hand, is not a thing. It's just two words next to each other. People will scratch their heads as to what you mean, and you'll need to explain it with further terms in a circumlocutory way.
And that's not by accident, it's because (2):
(2) The second issue is that in german adding two words together (or more) "parses" in the language, and creates a valid new term (with either an obvious or a culturally transmitted meaning).
In English that's not the case. You can't just say "This is an improvement aggravation" (I mean, it's a free country, so you can, but people would just think you've made a syntactic mistake).
>I don't really agree much with your last point. Someome still has to come up with the word in German, and others have to use it.
Yes, but like in Lisp with macros, in German the speaker (programmer) is allowed to come up with such words.