I just bought an XPS 13 9360 and returned it due to the coil whine. I've never had that issue on my Macs before so once I get refunded I'm going to buy a MBP instead.
I'm in a similar boat. I'm replacing my 2013 13" Pro with a new XPS 13. It just came yesterday so I can't really review it at this point, but I'm impressed so far.
Maybe, but it may not be a huge issue. I've had very good luck using apps split-screen in Android 7.0, which has a similar aspect ratio to classic BB devices.