I am strongly in favour of retaining hyphens almost everywhere!

I have two main reasons for this:

(1) It makes it much easier for readers, new to the language, to find words in the dictionary (so long as the dictionary is incomplete). For example yesterday Dmitry assisted me doing a translation by providing me with the word "noreparibilem" (= irreparably / irremedially). This was for the sentence "Kopérnikus, Kopérnikus, kare don Elijio, he ruini jenley, noreparibilem." (from the original Italian "Copernico, Copernico, don Eligio mio ha rovinato l'umanità, irrimediabilmente."). Obviously "noreparibilem" is not in the dictionary, but "repari" is. Now, "no-reparibilem" is easier to find in the dictionary because the user knows to search for "*repar*" rather than "norepar*". Also, the etymology / word construction is clearer. One could go further and hyphenate most suffixes too, but I am too out of practice of LdP to give a concrete example here.

(2) When I write LdP, I like to imagine I am writing Chinese, in which a concept is represented by a character and then characters are combined to form compound concepts. One can always see the individual characters and the separation between them, and that separation is conceptual rather than merely phonetic. I think to write LdP similarly, with hyphens separating what would be characters in Chinese, is in principal the easiest possible way to write. Building blocks are put together with hyphens to make words. For example, imagine "no-reparibil-nem" as a compromise, assuming that "reparibil" were listed in the dictionary; alternatively, consider "no-repari-bilem". The reader can clearly see "no" = negation, not ... "repari" = repair, "bilem" = adverbial marker of ability. Or whatever. And each part could be strongly recognised as a conceptual unit. Long words like "noreparibilem" start to look incongruously difficult and rather similar to, say, Interlingua's "irremediabilemente". They are harder to pronounce too since it takes longer to decipher them into syllables, the way the eye works, in my opinion. Please excuse my clumsy examples, I am just trying to convey the general idea.

This is just my small thought (my two cents).