I dont see how HW design is silly.
Its a great design to me. Whether a design is good or not is never objective...unless its some machine or something and it just isnt practical or it breaks itself.
Before I break the problems with HW design, let me break down something you said.
"Whether a design is good or not is never objective"
If I make a design of Impa where she's only wearing one piece of armor and the rest of design is just a skin tight suit, is that a bad design?
Objectively yes because it wouldn't look like it would protect her and it would look like I made her design just to be fan service.
There's nothing wrong with liking the design yourself and that's you own opinion and that's fine, how ever your not ever going to tell me that design is good because it looks like just to be **** bait.
I think what you should have said was, "Whether or not a design is well designed for the propose the characters designed for can be subjective, how ever it is OK to like the design regardless or not."
Now with that said let me explain why Impa's HW design looks silly.
First a picture of the Warrior.
Now this design is cross between her OoT and SS design (one of which I say I hated) and at first look you would say "Ah yeah this looks cool" but there's something off about it.
...So did you figure out what's wrong with it, well let me give you a hint, it's her breast plate.
Well Single boob plate to be more extent, I understand that they wanted her look stylish but looks silly, why not a full breast plate? Because the designers wanted her to look cool? So the designers wanted you to know she's a women? Because they can?
It's also worst when you realized that her back is exposed and this version of Impa is more Samurai then Ninja so her being fast is kinda out of the question, well that and the fact that she's a fictional character so in game logic on why she dress like this is moot.
I going to quickly break down more reasons why this design looks silly.
-Heels for no reason
-She metal plating on arms but theirs nothing covering her arms but the metal itself
- Her lower legs her covered with metal but the back are exposed for some reason
-Her head is exposed and while I can understand they wanted to show her face, they could have give her a samurai like helmet
-Above and below her boob plate their nothing covering her skin
-Opened toe shoes
It feel like they tried to make her a Samurai but also wanted to pay tribute to her SS design so they added some weird stuff to make her look cool and failed, well in my opinion anyway.
Look if you like her design then that's fine but it does look silly.