I am well aware that the proposed new station just South East of Cross Gates is not in the centre of Leeds, but that is the point. Engineering lines into city centres is expensive. There is nothing stopping trains going very fast until the reach the "parkway" and then using classical lines to head into the city. This is the tactic that CRH have employed with Shanghai and it makes perfect sense.
While the OOC example is extreme, it is not as extreme as what I would propose, which is a station near Kings Langley on the WCML to let half the trains go from there into Euston, with HS2 continuing around the M25 roughly to connect with HS1 in East London (possibly as part of the new East London development). In a perfect world it would be possible to get trains into Canary Wharf and Stratford, but I do not know how feasible that would be.
I genuinely believe that we are obsessed with the idea people want to go from city centre to city centre, but that is not true, hence the success of Stockport as a station (which in HS terms may as well be Manchester because stopping a train so quickly would have massive time penalties), it has good access for the M60 and is convenient for most of south Manchester to reach.
I do not have the software to run a model, but compare how many people can reach Lymm within a 25 minute drive (or equivalent public transport journey) with how many can reach Manchester City centre. I think the conclusions will support the idea that at least half of HS trains would be better serving a station to the west of Manchester at "Warrington".
Similar exercises would support Toton over Derby/Nottingham, Birmingham International over Coventry or Birmingham etc...
When we plan HS routes we need to think about the cost and the wider interest and not just focus on established centres, which, like Shanghai, can still be served by HS just with trains making 100mph journeys for 10 miles or so at the end of the route.