The reality of modern Doctor Who is that none of the arcs worked.
None of them. Not a fucking one.
The strength of the revival was always based on individual episodes that were only tangentially involved in the arc, with a rotating pool of writers. The showrunners always - ALWAYS - whiffed it.
Nash
I am still a dedicated Steven Moffat hater. as a single episode contained story writer, awesome.
But I disliked every single season long story arc