But certainly seeing as much of an "ultimate purpose" to aim for, as we can, is helpful. We have ideas of parts of it. Creating knowledge is good, and destroying it is bad. Freedom is good, and controlling other people is at best a temporary stopgap measure, not an ideal. Cooperation or indifferent tolerance is good, and violent conflict is bad, both because it's destructive, and because it's not a truth seeking process. Settling for less is not ideal, and anything that puts pressure on people, or creates incentives, to not strive for all we can, is bad.
Some of these assertions have directly applicability today. For example, the common perception that striving for more is "hard" (unpleasant) indicates something or other is going wrong. Or there's the idea that life is about compromise, which is essentially settling for less. People don't just fail to find a with to proceed with no downsides, but often people don't even try, and assume such things do not exist. The ideas in our culture which cause these attitudes clearly have room for improvement.
"moral philosophy has to do with determining the end"
Yes, but that's not all. How to approach goals, how to solve problems and correct errors, what sorts of policies for how to live your life are effective, are also very important topics (and perhaps more accessible and directly useful). One of the critical ideas here, I think, is that all these things depend on knowledge. How do you approach a goal? In general, you need to create knowledge about the goal and how best to approach it (and also whether it's worth accomplishing, in case it was mistaken). To solve a problem, you have to figure out how to solve it. (And if implementing the solution is hard or unpleasant in any way, that could be avoided with still more knowledge of how to solve the problem in an easier way.) To correct errors, you have to create knowledge of what ideas are in error, and what would be better ideas. And so on. And therefore, anyone who is seriously interested in morality ought to study epistemology.