You're not really helping yourself by linking two completely separate projects in a way that reads a bit like 'if we can't have X they shouldn't have Y'. I'm pretty sure you'll find that almost everyone here would agree that the new Piccadilly platforms ought to be built. Personally I think the decision not to proceed was an awful decision. And at the same time I fully support Crossrail. In the end, both Crossrail and the extra Manchester Piccadilly platforms are projects that will help a lot of people, and make a big difference to public transport in their respective areas. Crossrail obviously is a bigger project, costing more, and with correspondingly bigger benefits. Both ought to be built. And both ought to be argued for independently on their own merits. But saying something along the lines of 'we should have X just because the other people have Y' or anything along those lines is not a sound argument.