Why hasn’t apple thought of this yet?

Hello. My question is why doesn’t apple have more bluetooth settings?? What am I refering to? Well, On Android you have the option to assign a function for your bluetooth devices. You can choose the radio to only play Media and your headset to only work for calls. Welp, when you have Iphone you can connect various bluetooth devices but can’t choose there jobs. I am a truck driver and I cannot even make a phone call because the call goes to the radio that doesn’t even work well for calls. Even though I made the phone call using Siri on my headset. The only way to transfer the call is to take my eyes off the road and manually switch it to my headset. I mean really?!