I don't follow. It is eminently applicable to practical realities, unless by "practical realities" you mean sheer political intransigence. There is no doubt that our economic and political leaders continue to act as though we are on the gold standard, but that is harmful because it places limits on what we can do that do not actually exist, e.g., we can't "afford" single payer health care. (Indeed, limiting public power vis-a-vis private economic power is arguably why the facade exists in the first place.) So step one is getting people to understand the monetary system we have and go from there.
QE is certainly a recognition of the kind of monetary system we have, but it is a discrete policy applied by the central bank. It is not a democratic accounting of what our government will be spending money on (or removing money from), i.e., it does not allow for people to vote to have a single payer health care system. The point is to democratize government spending and free it from self-imposed constraints that cause harm.
There is no reason, for example, why people should talk about tax policy as though it funds the government when it simply is not true. It is democracy-distorting. If we are going to discuss tax policy, we should discuss it based on its actual purposes in our monetary system. Likewise government spending.
See also, e.g.,
http://neweconomicperspectives.blogspot.com/2012/01/mmp-blog-31-functional-finance-monetary.html
