A slightly odd objection
There is, obviously, a problem with this. What happens if the UK Government is unable to command a majority in England - even worse, what happens if the opposition (for which, read the Tories) are able to command a majority in England? As Vernon Bogdanor puts it:
There would, therefore, be one government for English domestic affairs such as education and health, and another government for UK-wide matters, such as economic policy, social security, foreign affairs and defence.
Well, yes. That's the inevitable result of devolution. Democracy is messy and, as we are seeing now, leads to compromises and coalitions. That's not a great argument for getting rid of it though.