
The lack of structure would become the structure. Very few artists do this all the time though, the unusual becomes the expected very quickly if you keep doing it. with E-bow the Letter, Tom Robinson’s War Baby are good good examples but even these have a central, structured hook that they revolve around. You can certainly freeform lyrics and have them work, R.E.M. I’d say that the sky is the limit, but it’s not. Song writing is a practice that has no specific approach that should be taken and largely depends upon the author and their years of experience and creativity and insight into the idea of songwriting itself. Sometimes I will choose a time signature and literally tap out a syllabic structure that I later replace with lyrics that fit. Sometime I will have a concept or feeling that I want to convey and I will try to come up with lyrics and tones and moods to match the feeling or concept. Sometimes I will sing random lines as I strum or pluck a tune until it later transforms something more meaningful. Sometimes one lyrical line and melody will come to me and I will build a song from there. Sometimes I will write lyrics and then put music to it. Sometimes I will write music and then put lyrics to it. Personally, I approach writing songs in many ways. I would say that lyrics somehow have to correlate with the rhyme and meter, but it is not always directly so. The more specific your language for describing how your music works or doesn't work, the more accurate your diagnoses will be. You want to be like a doctor, treating the disease not the symptoms. Certainly trust your gut feelings, but really spend time trying to figure out exactly why you like or dislike a certain thing. I will say, for your sanity, instead of "good" and "bad" always look for richer adjectives for describing the various components of your music. There's also a variety of rhymes to play with aside from perfect rhymes, which can make your song sound simplistic/dumb (the nursery rhyme effect). Rhyming is less important to lyrical musicality than meter, but can make your lyrics more memorable for yourself and your audience. Just expect people not to always "get it" lol. Without attention paid to meter the lyrics can sound rambling or awkward, not particularly singable, which in rare instances is an effect you might be after. "Split Myself in Two" by Meat Puppets is another example I've heard. "Jeremy" by Pearl Jam for instance kind of eschews a sensible meter in the verse.

Usually a looser lyrical meter is more acceptable in certain styles of punk, especially grunge. Without those things lyrics can be okay, but it depends on context
