As somebody with a good deal of experience of preparing legislation (albeit not in the UK), I can assure you that there are plenty of people asking 'what if X happened?'. The difficulty is (a) there's invariably pressure for legislation to be published far faster than is sensible and (b) there is always some-one who pops up at the last minute with a 'vital' change to the legislation, which is then made in a mad rush and turns out to have unintended consequences. There is also the problem that when people are mostly interested in what happens in one context, they have great difficulty keeping in mind that the legislation will also apply in other contexts, even if they are theoretically aware of that.