Does skincare sometimes feel like a bunch of trial and error?

I’m researching a skincare idea and would love brutally honest feedback from people with breakout-prone, reactive, or sensitive skin.

I keep thinking a lot of us waste money guessing what our skin will tolerate, and I’m curious whether people would actually want a more structured way to test skincare actives one at a time before buying full-size products.

Not selling anything, just genuinely trying to understand:

• how you figure out if a product or ingredient is breaking you out • whether you’ve wasted a lot of money on skincare that didn’t suit you • whether this sounds useful or completely unnecessary • what would make you instantly not trust it 

Please be brutally honest. I’d rather hear why this is a bad idea now than later.