Therefore, using that logic it's safe to descend below MSA in IMC conditions! I disagree.
That is not what I said at all - the point is that it is not safe or unsafe it has a
level of safety, even staying above MSA cannot be said to be
safe per se, if you are have an MSA of 2,000' and you go from 2,001' to 1,999' have you REALLY gone from safe to unsafe, what you
can say is that, generally, remaining above MSA is going to be relatively safe, if you go higher than that you are safer and if you go lower you are less safe, and the further you get below MSA the more unsafe it becomes, but even that has variations, for example if you are sitting in a light single at 2,500' in icing conditions with an MSA of 2,400' and you get a pirep that the cloud base is 2,350' what is the safer option?