1) I can combine the best characteristics of both races into my offspring while yours will be lacking.

Like African Americans? Most of them are mixed race yet I wouldn't say they have much going for them besides sports and then not clearly in any way better than Africans. I honestly think AA are typically uglier than Africans as well. The great race mixing experiment in the US produced a group of people who are typically violent, with lower cognitive ability than their white progenitors, and are often disliked even by other Africans. Most of the Americas are a huge race mixing experiment and the results are not encouraging for basically all the mixed race groups.

This idea really doesn't have any basis. There's no evidence race mixing produces an individual with the "best" characteristics of either group. It probably stems from the idea of hybrid vigor but this doesn't really exist with any consistency in animals.

2) I've increased the pool of women I can date.

If your goal is to just fuck as many women as possible then I can't really make any argument against this although I would encourage you to reconsider your values in life.

3) I can learn about the world of another racial group.

You can do that without having sex with them nor do I see why this is a major boon, it's more like a trivial interest unless you for whatever reason are seriously invested in adapting to their culture.

4) Hot sex.

This is some coomer brain shit. If having sex with an attractive white woman (which is the average non fat white woman) or a woman of whatever race you are is not "hot" enough for you there's something wrong with you.