I don't know. My mind is splittet in this point.
My art actually is at a point, where I surely can draw a good background, but I want to work smarter, not harder.
If the outside lining and all of an Clip Studio Asset fits into my art style, why shouldn't I took the techniqe that is there, to fulfill the work a little faster? (Tbh, I don't know if you ever tried these options. xD But also adjusting the angle and setting it right sometimes takes a lot of time. I also watched a tutorial a while ago, where some artists build a complete own City with these assets.)
Sure, it's not like drawing them all by yourself, but these things were made to make the life of an hobby artist easier. (And a lot of Pros use these too! )
We don't have a full team in the back, to complete our work, like artists of Japan or China have. So I think it's fine, if you use some assets, if they fit.
But like I said. I want to learn to compose them by myself, so at least it's all done by me 