I feel there's a lot of misunderstanding here.
There's nothing wrong with exploring possible combos, setups, etc. However, most players go about this process with complete disregard for practicality. Finding a 50% combo is going to do little for you when your opponent blocks your slow, unsafe, unconfirmable normals, then punishes you.
Optimizing combos is very important, sure. But, you should always consider how exactly you're going to land that hit, and what your opponent can do to retaliate when you don't.