Perfect! Also imagine the UI designer suggesting something like iOS7 for their client, is simply not feasible.

I also think this is more about what is the current trend and this isn't exclusive to UI design. Clothes from the 1800-1900 also look cool, but no one is wearing because they're going to look weird to the eyes of everyone else.

It has something to do with "making the person realize the problem by themselves", because some people get offended if you directly tell them "do Y because it's better", but I completely agree the way is being done there is not effective.