@kennethamy,
wwll I suppose 'abstract' is not a very good qualifier in this context. What I meant to say is that many of the problems contemplated by philosophy are real, even if they are large and hard to define.
I do take your point about maintaining a sense of philosophical detachment. After all Marxism did debauch philosophy in many ways by relating it too directly to the conditions of material existence. Which lead to a connection between dialectics and shoe quotas which as we all know was a complete disaster.
But I still think there is, and must be, a practical application for philosophy in these large questions. Descartes may not have been concerned with politics or economics, but without the conception of Cartesian geometry, the Scientific Revolution could barely have got underway. His search for an indubitable truth did indeed yield a major breakthrough in the application of thought to technology.
Democratic liberalism was founded on, among other things, the work of a number of very important philosophers - Hume, Locke, Mill, and Rosseau, among others. Now I think we must ask ourselves whether in light of what is happening with economics, politics and (especially) the environment, some of these basic tenets need to be thoroughly questioned. Marxism tried, and failed, in my view. Something of equal magnitude needs to be developed, which is constructive and not destructive, as marxism turned out to be. And it will be built on the basis of a new philosophy.