UD4 is an amazing piece of tech, but its hard enough to do some decent modelling to later create good texturing and materials working in projects needed for "yesterday", adding the extra baking and unwrapping (and optimize everything from polycount, texture resolutions and all that is involved), in some cases just.... scares a little.
Dont get me wrong, i'm quite capably to do that but is a lot of work, besides some clients does not have the power machines we use to work so if its not optimized it simply wont run.
There is copious amount of work involved in unwraping a simple wall with custom details. Not even start about a whole lot of small assets.
But actually if you manage to avoid the unwrapping aplying some wild "white or solid" color palette to almost all, i think it worth the shot, more like a toy and if you really have the time why not get serious and create some 3d walktroughs using some like Oculus Rift?.
Maybe there is someone around who can pay for that and have the time to wait for it.