As a KEF dealer, here is our scoop on this question.
1: The app isn't great but it isn't bad it just lacks the kind of user gui that better devices such as the NAD Blue Sound have.
So I would just use the LS 50W as it is for now.
2: What is exciting is that in a software up-grade which is comming which will make the LS 50W a Roon endpoint and you don't need to add any additional hardware.
Once you have experienced Roon there is nothing like it.
So I would just purchase a set and just wait until the update goes live.
The LS 50W are terrific and for a Bedroom they are perfect we have our demo set with an excellent Athom based subwoofer and the package for roughly $3,200.00 just rocks.
We do recommend getting a good set of stands and bringing them out further into the room then just putting them on a shelf.
If you are using them on a shelf then get a set of Isoacoustics footers or an Isoacoustic monitor craddle for dramatically better sound.
If we can be of any futher assistance just reach out via PM.
Dave and Troy
Audio Doctor NJ