I am entrenched in both Samsung and Apple ecosystems. You would be surprised at how close the Samsung ecosystem is to Apple.
Maybe the hardware. But Apple has the combination of all 3 - hardware, software and services. Which allows for things like the following:
1) Use Siri to play music on Apple Music on your cellular watch. On your Samsung wear, you would be using google assistant to stream music from Spotify.
2) Apple, by virtue of having aggregated the best customers in the world, is able to incentivise developers to create apps for the App Store either first or exclusively. Meanwhile, Samsung still largely taps on the google play store, and I am struggling to find any meaningful differentiation in their own Samsung Galaxy App Store. On iOS, I have apps like lumafusion, ivory (mastodon client), overcast, fantastical, notability, lookup (a very nice dictionary app), and (once upon a time) tweetbot and Apollo. Whatever the best third party apps that Android has, I am willing to bet that they don't come close to matching the best of class apps that iOS is host to.
3) It's good to finally see Samsung commit to 4 years of software upgrades minimum for their line of flagship devices. Though I am recently seeing more people around me walk around with a green line on their Samsung phone screens, which I understand was caused by a recent software update, and one that Samsung is refusing to fix or acknowledge.
4) Apple, thanks to their video streaming platform, is starting to create content designed for the Vision Pro. This in my opinion is the true power of their ecosystem - how Apple is able to use their existing platform to give a leg up to any subsequent product that they release.
5) Samsung has folding phones, but not the influence to push developers to support their apps properly for such a form factor, it would seem. This is what happens when you don't own the underlying OS.
So it would appear to me that Samsung is only able to ape Apple's ecosystem on a very superficial level.
I continue to be impressed by how one company is also to stand up against Samsung, Google, Amazon, Microsoft, Facebook and Spotify (I may have missed out 1 or 2 competitors here), and this all goes back to Apple having total control over their ecosystem. We also see how the narrative has shifted over the past decade, from Apple constantly being one flop away from irrelevancy (Apple's low market share was often cited as a sign of an incompetent product strategy) to Apple having too much power, and government regulators being viewed as the only entity capable of protecting Apple users from Apple (total poppycock, in my opinion).
What I am ultimately trying to say here is that anyone thinking that Apple users are somehow being forced against their will to buy products like Apple Watches and AirPods is nothing more than looking for someone to blame for market failures when they should be blaming the competition for bad vision, inadequate corporate culture, and a lack of understanding as to what makes Apple unique.