I say that the biggest flaw on Arrow is fan pandering in that the writers chose to cave into the demands of a minority of Arrow’s viewership. Most Arrow viewers don’t care about Olicity. Some don’t like Olicity.
To give you an analogy, it’s like somebody began pandering to a segment of the viewership that liked panty shots. The programme gets filled with panty shots and then if it gets boring, add groping. Arrow S4 is like this plus the possibility of airing a masturbating Felicity Smoak for instant shock value.
Since the viewership for Arrow has declined, writers will find new ways to get outsiders interested again but Faplicity Smoak could haunt their dreams to no end.