Why are end points not changeable within components?

Maybe I’m the only person who is using icon libraries that need to be adjustable in style to a variety of scenarios (I’m probably not), but the fact that I can’t edit the end points in icon components without detaching the component since years is actually driving me low-key mad. And I have survived a lot of things so far. 

So curious why this property can’t be edited and if we can please get this ;)