We have had similar issues on the 8.4 Uconnect as OP, but not the door lock problem - but we have a 2017 Trailhawk, not the Limited. Our 2018 Latitude will only have the 7" screen without Nav because I ordered a manual transmission, so I don't expect to have similar problems - but probably will have different ones! These infotainment systems seem to be buggy, and not just in the Jeep. My 2015 Honda Accord has freezing problems, call audio confusion, transfer confusion, and sometimes the playback through the bluetooth from my phone freezes/blanks out, and I have to turn the car off and back on... not such a big deal because it's a manual transmission so I'm able to just coast - kill it and restart it while running down the road, though not the SAFEST maneuver LOL!
As far as lack of storage space, i.e. sunglasses, I agree - it's definitely a feature we have had previously that we miss (as in we had it in our 19 year old Camry!) ... and the lack of a space to keep a cell phone! We have Apple Airplay, but have to put the phone on the seat, or in the cupholder, or buy a mount for the air vent, or put it in the net compartment (which is too far away when we need to use the actual handset for something - like when the uconnect craps out... )
I'm going to design and build a new cradle that fits in the tiny change compartment so that the phone can be mounted, plugged in, and handy at the same time, while not blocking anything, or rattling like crazy (like the vent-mount we bought does)... I have a plan, just need to implement it