I have implemented many custom form controls. The reason is almost always because the design requires it. But other reasons can be to "improve" the control; for the select box to make the invisible edit buffer visible. I appreciate this is not the way but it is also pretty annoying how limited the styling, and customization, of form controls is.

We use Angular so it's pretty easy to hide the custom control and have a plain control for accessibility. At least for checkbox and radio inputs, am I the only one that uses a hidden input to control the style of some div to make it look fancy like the design required?