I'd disagree with Apple Silicon not being comparable to iPhone. It completely transformed the Mac hardware, leapfrogging existing products. We're just so spoiled, we are like fish in water. We don't know we're in water until we leave it.
Could you imagine the Vision Pro being released with off-the-shelf processors? Wouldn't happen. Sure, it's heavy and expensive, but it's PACKED with super-powerful tech that is better than anything on the market. It's just priced out of reach for most people. Apple Silicon is the reason that the Vision Pro exists.
I think to qualify as an 'iPhone moment' something has to both be incredibly transformative and see widespread adoption.
I really like my Apple Silicon MacBook and it's been a massive evolution over the Intel chips, but at the end of the day it hasn't really changed how we use our devices. The Macs are faster, so are the iPads, but fundamentally they're the same products as before.
Maybe AVP will take off and change everything, but that remains to be seen.
I don't think AS is an iPhone moment, but very very very few things are and that's okay.