While it's true that taste is subjective, relativism can't be applied without limitations, otherwise all products would lose their identity. I'm sure there's someone somewhere who likes ammonia in a cigar, it doesn't mean that cigars that taste like ammonia are "just as good" as cigars that don't because someone likes them. There are also many people who like the taste of young wines so would you also argue that there is no benefit to aging wines? I don't think so.
Cigars DO benefit from aging, obviously up to a point and some more than others, same with wine, whisky, and a lot of other stuff. And with benefit I mean the development of flavors that are historically considered desirable in relation to a specific product. This is a well known fact. Now, your personal preference? That's a whole different story.