There are going to be people who ignore technology & focus entirely on magic and mysticism, just as there are people who ignore magic & focus entirely on technology. Technically they have that as mystics in the game and maybe I'm being a little pedantic in wanting a class that's flavor is 'got their power through study rather than divine will', but the mystic is still flavored more as a divine/spiritual/psychic class than an arcane one. If anything the mystic shows that magic can still keep up with technology to some extent; I'm not asking for an arcane caster that's head & shoulders above everyone else, just something that's competitive with the mystic & technomancer.
I think what you are seeing is a shift in cultural approach to magic. Full casting may simply not be as advantageous as have a connection to sometime of universal theme or truth (or to having it be an inherent and integrated aspect of manipulating technology).
Even in Pathfinder, there were forms of magic long forgotten or barely retained and then only to a small isolated few from what the current understanding of magic was offering and had available. It is possible that those traditions of pure arcane might have been abandoned or forgotten over time just like things are abandoned or forgotten overtime in the real world.
There are people who're going to come from more nature-centric worlds that focus more on organic technology; technically we have that, too, in Castrovel, but I don't feel that we have any classes to adequately represent a lot of what's going on there, magically speaking. Playing a khizar, for instance, as anything other than a xenodruid would feel a little off to me, personally, and there aren't really options for playing a lashunta who's bonded themselves to one of those alien dinosaurs which, if I'm not mistaken, they still do. What I'm saying here is that assessment assumes that one way of progression is the only way of doing it while another alien culture may progress in a way that's doesn't involve technology completely overtaking magic, and diversity of culture is one of the draws of space opera.
Actually I think if you build a wild warden soldier with the phrenic adept archetype and connection inkling feat, you could pull off a half decent ranger impersonator. (of course without an animal companion). But I am sure we will eventually see some of that. They really just started developing Starfinder and they have a much slower production cycle on it then they did pathfinder.
Point being that while I appreciate and really enjoy that Starfinder is Science Fantasy, and I think that thru-line needs to continue, I also think that if there are going to be more classes - which as I stated, I think there should be - then at least a handful of them should play more heavily to the Fantasy part than the Science part. Not all of them, not a majority of them, but a couple of them.
I'm not opposed to some more fantasy aligned classes then what is already available although in truth I would like to see them present as either new and additional class options or new archetypes then straight up just new classes. However, with that said I'm gonna disagree that there isn't already plenty of fantasy influence and options in the game. Most people think of traditional "high fantasy" when they think of fantasy. I think that high fantasy starts to break down when several of its staples and constants are exported into other fiction approaches.