Philosophy isn't useless. It is a ground for preliminary discussion before the matter is ready to shift into more solid ground -- mathematics, logic, or hard sciences.
That it suffers from (a degree of) infinite dwelling on pointless topics is inevitable, because it is very hard to judge what will one day be useful or legitimate of discussion; making the false positive nil will increase the false negatives too much. Plus if philosophy decided on a too strict topic regime, soon another field would be born to house the outcasts of academic philosophy, thus becoming the new leftover pile of reason.
You speculate so.
First, Wittgenstein's ultimate views concerned the validity/fundamental meaninglessness of metaphysics, not all philosophical inquiry. There are other subjects in philosophy that require little to no metaphysical justification: aesthetics, mathematics, and certain branches of ethics are all examples of this.
Second, we (HN users) are all here because of philosophy. The fundamental theories and methods of computation stem directly from the work of philosophers in the 1920s and 1930s, who in turn were building off of systems of formal reasoning devised in the 5th century BC. The same can be said for our political organizations, our aesthetic considerations, and our basic Western metaphysical perspective. I'd call that "accomplishing something."
We're talking about the late 19th and 20th centuries in the cases of Frege and Russell (two of dozens), well into mathematics being its own field of study. I brought up the 5th century BC to show a continuous line of inquiry, but you can look into most philosophy departments today to see novel work in the philosophy of mathematics. I studied under some professors who did that work.
> If the best thing you can say about the pursuit is that many years ago its members contributed to studies we now think of as separate disciplines, well, that’s not much.
I'm not understanding this reasoning. The "separate disciplines" you're talking about would not exist without philosophy. All modern computing, mathematics, and political science stems directly from relatively recent discoveries and insights by philosophers. In my book it's a sign of tremendous success, not failure, for one field to spawn another.
You are affirming the consequent. https://en.wikipedia.org/wiki/Affirming_the_consequent
That sounds a bit solipsistic. Don't you believe other commenters exist?
Actually, I don't feel like commenting is ever productive (for me), but I enjoy doing it, or can't resist trying to make a point. Being productive is certainly not a motivation I have when thinking about philosophy, any more than it is for enjoying art or any number of subjects.
Being productive only matters when I have something I need to get done.