One major problem is "Short term-ism" (appalling phrase!).

Governments in general plan on the basis that they will be in power for one term (two at most) and, as any incoming government automatically claims the credit for any benifits which occur during their term - even if they had nothing to do with it - (and likewise, blame their predecessors for any failures<1>) and, as no politician likes to give their opponents a political gift. ALL governments plan only over a three (at most four) year period, anything longer, no matter what the outcome would be, is automatically discarded.

Walrus

<1> This is true of all governments, regardless of party.