I confess I don't understand stuff like this.
The Bruce Timm version of Batman is already a highly stylized design: the little square head, the huge shoulders and chest, the spindly little legs. I happen to really like it, but inarguably it's not a "realistic" portrayal: it's a stylized cartoon, and what defines BTAS Batman from a million other takes is that unique, specific style.
If you change all that around, giving him a big head and narrower shoulders and stubby arms and legs, it's not BTAS Batman any more. It's just another interpretation of Batman that happens to be wearing the same-colored costume as BTAS Batman.
I have the same problem with Funko figures based on Hanna-Barbera characters, or similarly distorted figures based on Mickey Mouse: these characters already started as cartoons, and what defines them is the style in which they are drawn. When you change that style, it's not that character any more. Anyway when I was a kid and didn't draw Mickey Mouse "right," all my friends were sure to tell me I'd blown it. It's funny that now people are spending good money on stuff that's just as "off-model," or more.
Having said that, everyone gets to have their own opinion, and for those who like this sort of thing, go for it.