Let‘s take the development of CPUs where for 30-40 years the observable performance actually did grow exponentially (unlike the current AI boom where it does not).
Was it always early days? Was it early days for computers in 2005?
And this is before we talk about new modalities that might take over in the future, like VR/AR, wearable AI "pins" (which is what I assume that Johnny Ive is working on), neural interfaces, and maybe even quantum computing. So I personally don't see any issue of thinking of what happened 20 years ago, and what's happening at the moment as "early days for computers".
This is of course a semantics argument, but in my mind "early days" is a term for the time before things stabilized, and I'm very unclear on what that means for a field that's continuously undergoing rapid growth. As another extreme case - what would you say were the "early days" for life on planet Earth? I assume that most people wouldn't be thinking of just the first 50 years after the first RNA molecules got enclosed in a membrane.