im no dev but ive always wondered, why dont more hb apps try and use the ui patterns of the 3DS/Wii U? lack of tooling? designer preference? i think itd be neat to see apps like universal updater look like a blue eshop for example
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it's pretty simple. pun unintended, devs like making stuff short'n'sweet. Like put Towers for Tilted Towers for speed and laziness for ex
short answer, takes less time than to model a whole new ui. a flat one is easier.
Usually a big indie thing, just for ease of creation.