Mehmet, though there is much to be admired in your article, it seems that you misunderstand what a makes up a vertical slice. You seem to viewing it as a narrow form of layered architecture.

The team I've been working with views it somewhat differently and uses it as a model of connected microservices (see, https://medium.com/the-techlife/building-software-systems-2ff5bed06277 ). We use it as a means of decreasing coupling and creating reusable components.

As the world transitions slowly and inexorably to distributed computing, clinging to layered or layered-monolithic deployments can only be an impediment.