That's a great point and an easy way to visualize it as an outsider, but it's not necessarily that simple.

For one thing, the iPad (market-leading tablet) and the iPhone (market-leading pocket touchscreen device) were not their first attempt at doing that. That would be the Newton, which was an actual launched product and a commercial failure.

For another thing, even Apple can't just become the market leader by doing nothing. They need to enter late with a good product, and having a good product takes R&D, which takes time. With MP3 players, smartphones, and tablets, they didn't exactly wait until the industry was burnt through before they came in with their offering; they were just later (with the successful product) than some other people who did it worse. They were still doing R&D during those years when they were "waiting."

Apple could still "show up late" to AI in a few more years or a decade, using their current toe-dipping to inform something better, and it would still fit into the picture you have of how they "should've done it." Not to mention, Apple's also lost its way before with things like convoluted product lines (a dozen models of everything) and experimental products (the Newton then, Apple Vision now); messing up for a while also isn't exactly bucking history.