There are a few omissions, bad execution and imperfect implementations from both companies that they should have got right from the beginning. Some are even pretty much standard on CE devices and our last gen consoles.
Below I provide some
XBOX One
No mouse/keyboard support
HDD not replaceable.
Takes too much time to load a game for the first time. Apparently installation is slow and you cant go in unless 30% is installed?
Voice Controls: This feature is sold as a differentiator and a primary feature. Experience is not consistent across all users and across all features. For some uses its flawless for others its infuriating, Its also the reason why many territories are delayed. This also raises questions if it will finally be worth it all the hassle because its hard to implement voice commands perfectly for all languages and so many accents. For such a product you cant afford to delay a release without taking into consideration the market peculiarities and that the product may still not offer consistency across all users. In addition commands are sometimes not very intuitive and explanatory.
No Dolby Surround from day one
No 3D BR compatibility.
DLNA support appears to be limited compared to previous consoles
No Bluetooth support
Requires an app ti be downloaded even for basic functions
IR Blaster doesnt offer a consistent experience. Implementation sometimes works sometimes it doesnt work as it should, sometimes it doesnt communicate with some models
One of Eurogamer's comments caught my eye: So voice control becomes the default input interface. On the one hand this is great, because it works. On the other hand, though, it's not so great, because the main reason you're driven towards voice input is the counter-intuitive design of the user interface
Considering this is an AIO console that expects you to use it to control all your devices, it doesnt completely negate the use of the remote control when you need to use a DVR feature from your set top box. HDMI in doesnt completely solve the problem
Watching TV solution provided doesnt work for everyone. In some EU territories it also appears that the feature doesnt work with some of the largest satellite providers. Yet
Internet browser still not very good
They still insist on having to pay through a paywall to access basic features or to be able to access a service that also requires subscription
Game recording limited to 30 seconds at launch.
There are a few reports about apps/games crashing or slowing down the console when snapping too many stuff
Not all apps support snap yet?
I believe the XB1 doesnt let you use external storage devices to transfer your media on? Need confirmation on that
All your saves are saved on the cloud I have heard. But what happens when there is something wrong with my internet connection in a specific perio. Will I not be able to save?
Controllers still require normal batteries
PLAYSTATION 4
There is a trackpad. That should have been implement day one for use on the UI. Especially the browser. Why on earth couldnt they implement such a basic feature? Its there. Its screaming "use me". And its one of the features unique for the PS4.
No mouse/keyboard support.
Standard media features not supported from day one: CDs, MP3's dont play. And if I am not mistaken neither is DLNA. Why?
No 3D BR movies from day one. Why?
Cant connect external HDD to save games on
Not much in terms of UI personalization
Suspending/Resuming games I believe is not still implemented?
Very limited apps for media. Atrocious.
Internet browser still not very good
Camera features extremely limited, support appears abysmal and almost nothing was shown to convince of its capabilities
No Youtube support for game video uploads
You cant save your Game video anywhere else!
No video conferencing supported yet?
Cant turn off light bar on the controller
You still cant jump into a friend's game
The USB holes are compressed between the upper and lower plates of the console and if your USB device comes with a thick casing it wont fit
I am sure there are more that I cant think of right now