I am totally with you guys,this shit should have ended,its already ded
But looking back,with each member of 7ds totally have their own arc to explain their backstory and shitton of chapter, merlin still not detailed explained like the rest of them.
We just barely knew that she is daughter of first demon general(and whats their family actually?)
While this might be mangaka defense for this extended shit,it still lame excuse to extend like this. Merlin should detailed explained in between meliodas - escanor.
It should really end of book at this point