EXT4 "meets" the POSIX specifications for filesystems. The specification does not make any requirements for data to be written out in any order - and for very good reason. If the application developer -requires- data to be written out in order, they should serialise their operations through use of fsync(). If they do -not- require it, then the operating system should be free to optimise away the physical IO operations.
As a clueful(!) application developer, -I- appreciate being given the opportunity to provide this kind of feedback to the operating system. I don't want one or the other. I'd like to be able to use both where and when I choose.
Application developers - stop being stupid. Fix your applications. Read and understand the specification and what it provides -everyone- rather than just you.