Just a weird observation from a relative n00b (I joined this forum a year ago, but have only posted a couple of times).
What caught my eye in the opening post of this thread was the phrase "semi-hollow". When they were first introduced, Gibson made a big deal about pushing the phrase "semi-solid" when referring to 335 style guitars. "Semi-solid" was used in Gibson ads, sales posters, and books on Gibson history including one that I have called "Gibson Electrics".
Now, it seems that Gibson refers to 335 style guitars as "semi-hollow". I went to Gibson's website and searched for "semi-solid" and got nine hits, none of which referred to 335 style guitars. When I searched for "semi-hollow", it returned 130 hits, most referring to 335 style guitars. Upon further inspection of the nine hits, I found that most of them were Les Paul docs. They weren't referring to LP's directly, just saying that the maple-mahogany two-piece body was unique to LP's and their "semi-solid" counterparts.
It looks like when first introduced, Gibson wanted 335's to be thought of as more like solid bodies, then more recently decided they want them to be thought of as less like solid bodies. It seems some marketing genius a-hole decided to change all of the 335 ads/docs to say semi-hollow but forgot to scour all references to the term semi-solid in other ads/docs.
Again, just a weird observation from someone who has too much free time today.
PS Full disclosure: I'm an old guy so I prefer the term semi-solid. Also, I own a '98 335 and it weighs a ton.