While the standard .NET CustomTagHelpers are very useful and robust, they need to be stylized each time they are used.

By writing my own classes, I can create the control styles once and then allow Intellisense to work with my model to create the front end uniformly.

Copy&Paste takes time and requires the user to remember each time how much or how little to borrow from a previous page. With this approach, I save time. Something that might have taken me several hours for a single page can now be done while I make coffee.