But if we hypothetically removed ilo, then "pi kepeken" would imply something stative, like tool, instrument. Right now, "pi kepeken" means something verb-y like usage or using.
Removing words by decree is far more disruptive than adding them.
Anyone know how resistant other conlang communities are to new words? Marc Okrand is very resistant to adding very many new words per year. Esperanto seems rather open to new words. I couldn't figure out what the process is for introducing new gismu, although the algorithm for their creation seems well defined. Laadan has accepted community generated base words (but not all that many!), which makes sense because coming up with base words for hyperspecific social situations is an important feature of the language.
I'm drawing a blank for any other conlangs--this is really only a problem of conlangs with users. Who cares if a word appears or disappears in a language that exist only as a specfication.