Some designers are just visual designers who are good at Dribbble shots. They master the game of super slick widgets and all that fancy dashboard gradient shit, yet lack analytical or technical skills. The balance of Beautiful vs. Functional UX/UI Design is clearly missing. But guess what? That's okay.
Design is a process of exploration. I think it's totally fine for a designer to design something pretty once in a while. Even if it happens to be unbuildable/can’t be coded. I see it more as an exercise or experiment.
The way some people belittle designers for how they create something is just odd. I simply don't get all the negative energy towards the hard work and time invested. Stop being a killjoy and let people design whatever they want.
Designers just wanna have fun.