Aren't all encyclopedias 'lossy'? They are all partial collections of information; none have all of the facts.

There's an important difference as to what is omitted.

An encyclopedia could say "general relativity is how the universe works" or it could say "general relativity and quantum mechanics describe how we understand the universe today and scientists are still searching for universal theory".

Both are short but the first statement is omitting important facts. Lossy in the sense of not explaining details is ok, but omitting swathes of information would be wrong.