I would suspect that the real reason is in the way that Assembly issues are always reported. The Assembly is almost invariably seen as a corporate institution rather than a political institution. Here is an example from the today's Daily Post:
"THE Labour government was accused of hypocrisy last night after announcing it was scrapping hospital car parking charges despite criticising the Welsh Assembly when it axed fees."
Throughout the article there is no mention that the decision to scrap parking fees was proposed by the Labour/Plaid government in Cardiff, it is always described as a decision made by the Assembly or by Wales.
The same has been true of almost any decision, good or bad, made since devolution. They have all been Assembly decisions never Welsh Labour Government decisions in the way that Westminster measures have been Labour Government measures. The problem that this has caused Labour is that Rhodri's popularity has been matched by the Assembly becoming more popular, rather than by Labour becoming more popular. Labour in Wales has been blamed for Westminster Labour's failings but has failed to gain from Rhodri's "clear red water" Welsh Labour policies.
This isn't just a problem for Labour however; it is a problem for all the parties.
When the Tories suggested scrapping free prescriptions recently they were seen as opposing the Assembly rather than opposing a Labour policy. When the Labour/Plaid government failed to help secure the future of Dolgarog Aluminium works in the Conwy valley last year attacks on the parties of government by the parties of opposition fell on deaf ears – the locals blamed the Assembly, and they wanted the Assembly scrapped not a change of Assembly Government!
Until we see an end to reporting of the Assembly as a corporate body, rather than as an institution that is as party political as the House of Commons, proper political debate in Wales will be stifled to the detriment of all of the parties involved in the Assembly.