In a nutshell, when it comes to WordPress it is an all in one platform which helps in creating a website, blogs and manage content. It has its advantages and disadvantages. When it comes to specific projects or sites which are to be created it may have pluses and minuses. It depends on the project, user and his requirements and strategies which define which application is to be used. There are many WordPress alternatives with different features.
To have an effective eCommerce sales funnel, you must first know what a funnel is even is and how to build one. Lead generation and sales funnels come in many different shapes and sizes. And they work extremely well because they often start off with a very simple task, such as a click or an email submit, and then walk the user through a process where they complete more steps (like an eventual sale) over time.