As a lawyer, you know that your law does not apply to all other jurisdiction/state, right? That being said, the legal advise you may give may not be applicable to the person who seeks your advise who would be in another country. This is why there is a separate bar exam for every country. The legal profession is not like being a doctor. Laws are different in every country.
That means, you might give an advise that is perfectly legal and effective in your country but would be bad advise if applied to the country of your client.
Do you not agree we could apply our legal research skills and analytical skills to other jurisdictions for the sake of research / information / amusement
and that our skills are better than the average
and they could benefit from us.
That is true. You man apply your legal research skill. But if you did find the answer for the question, then your answer will not be an expert opinion. If, for example, you are a lawyer in the US and you client is in Japan. You found the solution to his legal problem, however since you are not a lawyer in Japan then that means your opinion is as good as your client's, this is because you both are not experts in the laws of Japan.
You may be able to do legal research and find the answer, but you will not be able to give advice in an expert level. What I mean is that as a lawyer, you should know that procedural aspects are quite different in every country. Not only in procedure but also the very application of law.
The best you can offer, as a lawyer, in this forum is to state which country you are practicing and if you are an expert in international law. Because that is the only two fields I would say that can be offered by a lawyer online.