We don't only want accountability, we also want good decisions, and good advice, even on delicate topics. IMO this is quite a difficult topic.
Suppose you are concerned that some variants of a policy you're thinking about may be legal or illegal. There is a pretty large gray area. You could corner the relevant legal mind after lunch, and ask his opinion. Then there is no recording, only your memory.
Or you could email him, and get a more considered opinion. This is likely to lead to better policies. But perhaps some of the options you're considering are a bit controversial, and stating bluntly what you really mean (and what you are concerned about) is risky if your email may be subject to a FOI request. So perhaps you re-write it very carefully avoiding the worst options, or perhaps you run it past the PR people before emailing, or perhaps you give up and ask in the pub instead. These all seem like worse outcomes, and ones we should be careful not to encourage.