You're right - I was too broad in saying "the problem with philosophy" when I should've said "the problem that PG talked about which the OP doesn't in any way refute".
As for your thoughts on Philosophy, I'm not sure I agree - philosophers have actually wasted a lot of time arguing over what is in essence semantics, and even when they haven't, there has been plenty of (IMO) unimportant back-and-forth without any evidence or really anything to back it up. (Years of arguing over the mind-body problem without any shred of evidence supporting anyone's worldview).
I'm not sure if it's true, but I've heard it said that every field that ends up being practically useful or meaningful turns into a specific field, and Philosophy is all that's left. E.g. Mathematics, Physics, Economics, etc. Arguably, the fields you mention are also specialized branches that are not part of mainstream Philosophy (very arguably though).
As for your thoughts on Philosophy, I'm not sure I agree - philosophers have actually wasted a lot of time arguing over what is in essence semantics, and even when they haven't, there has been plenty of (IMO) unimportant back-and-forth without any evidence or really anything to back it up. (Years of arguing over the mind-body problem without any shred of evidence supporting anyone's worldview).
I'm not sure if it's true, but I've heard it said that every field that ends up being practically useful or meaningful turns into a specific field, and Philosophy is all that's left. E.g. Mathematics, Physics, Economics, etc. Arguably, the fields you mention are also specialized branches that are not part of mainstream Philosophy (very arguably though).