TSR2, thank you for the clarification.
In reality, as you infer, 23L is not much use as a runway for a stream of inbound traffic, but could be used for departures at any time. With 23R as the landing runway.
We were holding Sunday to land on 05L. Nothing on earth wrong with the longer, ILS-fitted 05R. Just that all aircraft had to use 05L.
There is a reason why MAN aren't using 2 runways. Countless airports around the globe have 2, 3, or 4 runways, and use them simultaneously. MAN cannot manage 2 when needed. What is this reason?