Web Forms is part of ASP.NET. There will be security patches but no new .NET features. Web Forms will be around for a long time because .NET is part of Windows. All new development effort is going to ASP.NET Core (.NET 5 and soon .NET 6) which does not include Web Forms.
Keep in mind, Web Forms is NOT a WYSIWYG environment. It is possible to drag toolbar items to the design view in Visual Studio but HTML and CSS knowledge has always been required to create a layout. Well, since .NET 1.1.
What is wrong with visual design in webForms and .aspx pages?
There is nothing wrong with Web Forms. The customer base, developers, moved to JavaScript frameworks which does work well with server control HTML generation. It makes sense that Microsoft moved to MVC to support the direction web development was heading and its customer base.
i feel like I have to "reinvent wheel" and manually waste much time writing visual controls, ajax events etc etc.
The fact is modern web development is JavaScript centric. There are many JavaScript frameworks and components that handle common web dev like tables with sorting and paging or a date picker or whatever gadget. You simply need to learn how to use the libraries which is no different than learning how to use server controls in Web Forms.