Yes, that is historically correct. You will find matte floor tiles paired with gloss wall tiles. Now the level of gloss might be higher today, unless you go with reprod.tile, but overall the scheme is correct.

You are not doing a palatial bathroom like the one above my post. You are doing a bathtub that is also a shower, right? You will have to squeeze just a bit of the ribbon tile on either side of your onyx-look center square, and it will not have the same effect as a 9 ft wide swath of it on the wall next to a freestanding tub with a square of onyx tiles, a ceiling that reaches for the heavens and the light of 8 foot high windows on all sides. It will be a small, dark, dingy cave that you are going to spend hours in, getting soap scum and maybe hard water stains off of textured tiles. And about those 24” wide tiles - your tub shower combo is 30 to 32 inches wide. How do you avoid the “sliver of tile at the end “ effect with 24” tiles? Look at bathrooms that are the size of yours and see how choppy it is to use all those different tiles in one room. I would also suggest you choose either cool grays or warm caramel’s. They do not mix well. Go to the “photos” section of Houzz and do a search on “tub/shower combo” and see what looks you like. Keep in mind that the current trend is toward fewer tile choices and a more cohesive look, no lines of deco tiles cutting walls into sections. If you don’t like to clean, look at Corian, Swanstone, and other solid surface products. Ones that are true solid surface have the same color all the way through, no gloss layer, and can be sanded with a 3M kitchen scrubbie if the were to somehow get scratched or scuffed. I have had my Transolid shower 2.5 years now and never scrubbed it once, just wipe down the walls or squeegee after most showers and clean the floor.

Have you considered doing a mix of the two? Here's an example from Fireclay's website and a sample installation from their SF showroom. We're doing a mix of 8" Fireclay hex tile on our bathroom floor using 65% Gypsum (matte) and 35% French Linen (glossy). We ordered extras of both colors so if desired we can adjust the use of before we install (i.e., after our installer lays out our design on the floor floor before he installs).

Design-wise, it just depends on how it looks. Usually it's shiny on wall, matte on floor. But it doesn't have to be. Show the tiles you're considering and...well, people will probably STILL ignore your request and keep saying it's too slippery and not answer your question (even though you are aware of that and I think it is safe to assume you will not use it if it is not suitable in that regard)... anyway show the tiles and see if that helps people decide. There are normal things that are done, and you're not doing it the "normal" way, but that doesn't mean that your particular choices don't work that way.