You mean "split screen"...... Why in the world I want to do a split screen when I am using a phone.
Hence why it's available for iPad, but not on iPhone...
I haven't even use this feature once on my phone, since it cut the screen way too much to make it useful. You do realize App can still run in the background on iOS? Plenty of App does it, it's up to the developer and OS control. Unlike Android allow background service constantly and drain your battery or constant sending tracking data back to facebook.....
How is RAM helping when you still have constant reset on apps? Makes no difference to user experience.
Widget, don't even get me started.... It used to be useful, but lately most widgets are either broken or the UI just stop updating after awhile. Not many developer even bother making widget anymore because the usage is way too low.
FYI, most phone these days including Pixel doesn't have audio jack anymore...