Via https://dict.leo.org/forum/viewUnsolvedquery.php?idThread=49... and https://dict.leo.org/forum/viewUnsolvedquery.php?idThread=16...
That's not what "worseprovement" conveys to me, you can worseprove a single part, intending to make it better, making that same thing actually worse by the very same change.
There's no reason to coin a new term at all, nor chasing this idea of using long German word as a replacement.
Meanwhile I won't be able to remember that German word longer than it takes me to close this tab. Vershumthingsomething.
Probably it would become "verskimbeserong".
"disimprove" works much better.
The similar word "unimproved" implies you did nothing to make it better, "disimproved" implies you actively made it worse.
But this is still just effectively adding "not" to the word. If you must join two words that are the antonyms of each other (like verbessern and verschlimmern), the closest match I can think of is the vulgar pun "fuxed", a blend of "fixed" (repaired) and "fucked" (broke). https://www.urbandictionary.com/define.php?term=Fuxed
This also applies to changing something. If it was perfect, and you changed it, and now it's not perfect anymore, then the work itself didn't need to happen, and was therefore bloat.
Most work is bloat. But we have tied continued existence to work (mostly -- we mistake work for value), so we've made infinite bloating appear mandatory.
As an aside, most of the human psychology (assumptions, beliefs etc.) is also bloat, and similarly benefits from debloating.
Article discusses qualitative aspects a la "if it ain't broke, don't fix it".
I see bloat mostly as "unnecessary dependencies." Things which, if you removed them, the product would improve.
e.g. importing a whole library for what could have been a simple function.
If something justifies its "weight", then it's not bloat. It's functional.
But there's also "feature bloat." If a feature or change doesn't need to exist, or makes things worse, then it's bloat. If you removed it, the project would improve.