Chances are: they are there on smaller keyboards too. It might not be in the usual spot while also hidden behind a layer but its there.
This used to be a showstopper back when most of the available keyboards are not fully customizable firmware-wise. With the advent of QMK and VIA(L) on a lot of readily available keyboards, however, you can pretty much put any functionalities anywhere on any layer(s) you see fit.
QMK (rather, "easily" accessible keyboard firmware creator) makes keyboard less and less reliant on having a dedicated button for all of the functionalities provided by full size.
No need to move out of homerow is super nice, especially if you dont need to use your mouse frequetly.
Helios - Caesura and Ochre - Lemodie for electronic music.
Jizue - Bookshelf and Mouse on the Keys - An Anxious Object for jazz.
Auxcide - of Atoms and Stardust for chiptune.
Kplecraft - L 012 for both chiptune And jazz.
Flying Saucer Attack - Distant Station for space rock.
Dedalus - Dedalus.
Not right now, but fumo does work on a preorder basis.
Also there is no guarantee on whether Gift will rerelease the same exact model of Cirno that is already released.