Fair enough, it does work 90 percent of the time but as soon as 23r is out of use its buggered. Having to backtrack doesn't work
To me it just seems a waste, they battled to get a second runway, and have ended up with one they can't fully use, with no plans of making it fully usable.
But 05L/23R is available almost permanently, barring for planned maintenance which takes place during quiet night hours when 05R/23L can cope with remaining demand just fine. Unplanned outages of 23R account for only a handful of hours per year. You don't invest multiple millions in a new taxiway just to provide resilience against that possibility, particularly since 05R/23L keeps at least a good proportion of movements flowing until 05L/23R can be re-opened.
In order for a parallel taxiway alongside 05R/23L to be justified, it would have to materially increase the movements capacity of the airport. But it wouldn't do that. Provided that 23L is always the runway designated for departures during westerly ops, and 05R is always the runway designated for arrivals during easterly ops, then that runway handles an optimal number of movements per hour. That is all that matters. If flexibility of mode doesn't increase movements capacity (and it doesn't), then why build a very expensive new taxiway crossing the River Bollin? If MAN has that sort of money lying around, they need to prioritise an apron extension and increasing capacity at T3, not constructing a white elephant taxiway.

