From what I've seen as a designer, development is highly opinion oriented. There are dozens, likely hundreds of choices you can make regarding languages, server

From what I've seen as a designer, development is highly opinion oriented. There are dozens, likely hundreds of choices you can make regarding languages, server strategies, 3rd party services, modularity etc. There is a reason why a part of the development process is actually called "design". Likewise, there are a lot of rules that apply to design. It's not simply about what something looks like — it's just as much about whether "it works" or not. If users can't find your "sign up" button, then no amount of engineering and optimizing the way it works will make click rates better. Developers and designers both have to think about usability, and there are numerous overlapping technical and aesthetic considerations for both to arrive at the final product.