Ah yes...well, fortunately my definition of my rock garden is whatever I want it to be
as long as it includes rocks and plants that please me, it qualifies as my rock garden(s)
Personally, I wish the truest sense of a rock garden wasn't limited to and defined as "alpine", by anybody--perhaps because I am in the freaking desert? yeah maybe--but seriously, we have some dang hash conditions here and many spectacular rock gardens sans alpines, even at the arboretums. I don't see why there can't be a modifier, if the general term is going to have a definition or a truest sense that it must stick to--like alpine rock garden vs desert rock garden. It would make a lot more sense to me that way, rather than defining a rock garden as strictly alpine and also forcing a small scale.
Words matter. Who is the Académie française of rock gardens? How do I join?