So what's the least important aspect of a conlang to me? To me, it would be whether the phonology of the language sounds "beautiful". This is more a pathology of the ZBB than the CBB, but a lot of conlangers seem concerned with making their language pretty in a conventional sense of the world, or want to make it sound "like Quenya".To me, perhaps the least important aspect of a conlang is the size of its lexicon. In fact I kinda just roll my eyes at the postings of word counts and such... but that's a separate thing.
Beauty is a subjective concept. What the creator thinks sounds beautiful may sound harsh to another member of the conlanging community. I personally think Arabic sounds beautiful, and I know lot of people disagree, what with all the velars and pharyngeals.
Do I like the sound of Kankonian? Yes. But more importantly, it sounds like the kind of language one would expect Kankonians to speak. Similarly, Hapoish sounds like the kind of language Hapoishans would speak, Tentan like the kind of language Tentans would speak, Bodusian like the kind of language Bodusians would speak, Javarti like the kind of language Javartis would speak, Shaleyan like the kind of language Shaleyans would speak, and so on. People have praised Tolkien's Quenya and Sindarin for their euphony, but they often forget that Quenya and Sindarin "fit" Tolkien's elves just as much as Khuzdul "fits" his dwarves.
Also, in Kankonian, the word for "eyes" is bwolwu, but the word for "roughy" is burneoph and the word for "to grunt" is khoerd. Instead of every word sounding Italian or Celtic for the sake of being euphonious, the words in Kankonian sound like what they mean.
So that's the least important aspect of a conlang to me. What's the least important aspect of a conlang to YOU?