Of course there is no necessity for excellence. The only necessary thing about human life is death; everything else is optional. Before your death, you can cultivate excellence in yourself, or not — many people instead cultivate hatred, addiction, or greed. There are many ways to cultivate excellence; learning is only one of them, and there are many things to learn. Mathematics, and in particular logic (which is what we are talking about here) are the foundation of all objective knowledge, but objective knowledge is not the only kind that has value.

The true philosopher, motivated by love for the truth rather than pride, is so noble in spirit that when she sees evidence that she may be in error, she immediately investigates it rather than turning away; and if she discovers that the evidence is valid, she immediately changes her position. I see such nobility so routinely among mathematicians and logicians that it is noteworthy in the rare cases where it is absent. I see it rarely outside of that field; in some fields, like psychology and theology, I do not see it at all. So I conclude — tentatively — that excellence in mathematics and logic promotes humility and nobility of spirit, which is the highest and most praiseworthy kind of excellence.

So, while I do not think the OP should feel guilty about not knowing those things, I also do not agree with the implication that there is nothing praiseworthy about knowing them.