I'm actually a little excited by the prospect of a large company (in this case Apple) having a battle with other big tech firms that might revolve around User-A

I'm actually a little excited by the prospect of a large company (in this case Apple) having a battle with other big tech firms that might revolve around User-Agent, or at least the concept of identifying users and treating them differently based on the software/technology they are using to connect to your services. I genuinely prefer the user experience of linux and firefox -- I'm not religiously opposed to Windows^, Chrome, MacOS, etc. I also don't generally complain when websites don't work well for me, or the experience isn't perfect, I know that kinda comes as a package deal. But, I often know that package deal is unnecessary. Netflix might not want me to watch 4K because of requirements from copyright holders, or some website might not have tested on Firefox so they throw up an error page (even though standards are standards...). But if I lie about who I am sometimes things work perfectly -- and those are the moments when I feel the unfairness sitting just adjacent to me, resting it's hand on my arm. In this case, I wonder how well Apple can make the web.spotify (and netflix etc) sites work on their hardware, and how much they will have to lie about who they are when they're connecting to those services. I'm absolutely confident that the hardware and software will be capable of correctly and capably displaying movies, playing music, etc. It's more a question of trust, truth, and power. For me, in my little home on my little street, while I don't usually fight that battle I'm still aware of the potential injustice. But when the big dogs fight over it? I feel it's good for me, shining a light on these kinds of issue. Netflix doesn't want to spend money and put dev work in to making things work perfectly on Apple's headset? That makes perfect sense, no problem. But attempting to block it, if Apple has spent the time and money to make it work? That strikes me as unfair. You might argue it's not a 100% clear cut issue - should platforms have some say in how their content is presented? - but I feel very comfortable disagreeing when a website says "must be viewed using ACME OS™", or even worse, "can be viewed everywhere except COMPETITOR OS™".