Point some of the drawbacks of 15.Unreal Engine version...

In the Unreal Engine 4, there is a problem with the process of executable size.
The embedded system cannot be used, hence the exact size cannot be measured just like that.
Gaming has started to feel deceptively difficult on use.
Many people would start using blueprints of the game as the free version and think it is incredibly easy and there is no real need to code this programme.
Epic patches/updates/changes the engine all consume a lot of processes with data and time.
Documentations in the Unreal engine are generally sparse and out of date.
There aren’t many tutorials, books, or demos for Unreal engine programming so its often the programmer needs to figure things out.

Point some of the drawbacks of 15.Unreal Engine version 4?