i mean, size constraints, sure. But camera bumps ONLY get bigger, and more unreasonable. Remember the iphone 6? little itty bitty nub. That's not the case anymore.
apple? (Idk, i dont care tbh) recently unveiled the incredible technology known as "two mirrors" in order to abuse the dimensions of an iphone to get a longer focal length.
Even then, surely you could just put a bigger, higher resolution sensor on it, and then use digital zooming instead. That way it at least pretends to have features. Even then why bother adding more features, it's a phone, all it's going to do is be a nuisance at family gatherings. Because for some reason people HAVE to take pictures of everything.