It is definitely true that bassy doesn't mean bad, and upon the same logic, a present treble cannot justify a device as prestige. But in the case of Xelento, its troubles come mostly from its lack of mids and a bass which comes with more quantity than quality.
The t8ie mk2 is more like an updated version of the xelento. It presented a rather more enjoyable sound with the same degree of comfort that xelento provides.
Besides, there is one thing that I found strange upon my several fast glimpses of the head-fi forum.
I've only registered and become active on the forum in the recent week. As I'm from China, where access to the head-fi forum is hard because of how things work.
Back in China, we also have our own audio forums. On those forums devices such as "KZ ZS10", which actually originates from China, are barely discussed. As Chinese people, we naturally have more inclinations towards Chinese firms and products, such as Hifiman, Lotoo, and Caiying (though I personally dislike Caiying). But small firms such as KZ are generally disregarded by the majority. However, it felt like that those Chinese products which were neglect in their home country, gained more popularity in Head-fi than in any Chinese forums.