“have optional calls” is not really how this works.

If you’re in an interpreted language, like python, java, c#, you don’t have to do anything, because they compile for the architecture they’re running on already, i.e. using whatever CPU features are available.

If you have a compiled language, and your users compile themselves, then they are choosing which CPU features to use, so you don’t have to do anything. If you distribute pre-built binaries, then you simply have to compile it once for each architecture you want to support, and distribute the correct binary to each user (usually done with an installer).

For graphics, your graphics API also already takes care of using system-specific instructions, and shaders are compiled by it before/while running also using system-specific instructions.

So there’s really no “optional” path that you have to specifically put into your program, so nothing like

Func work()
    If isArm then doArmStuff()
    Else if isZen4 then doZen4Stuff()
    ...
End

And you are missing my point.

Downloading the music and transferring it to your phone can work automatically, you don’t have to do it yourself. The manual way is what most people know, including yourself. But I never did anything but press on a button, and suddenly a song was on my computer and on my phone. One button press.

That’s exactly the same as what Spotify does.

No, sync can be automatic. There’s no way to forget.

I was joking. I didn’t think “transferring music to phone” is any problem at all, because I simply had a folder set up to sync. But it seemed like you needed Spotify to be super convenient and no alternative to be possible, so I just joked and didn’t say anything about my real setup.

I still used my cassette player

I’ve always just had to type a songname into a box and have it 10 seconds later. So Spotify gave absolutely no advantage in access to music.

The only semi-relevant new thing Spotify had was music recommendations, but I never cared about that. I’ve never had trouble finding good music organically, nor even the need to listen to new songs all the time.

So yeah, for me, it never was more convenient than what I had before and I don’t think I’ve missed anything.