This is how science works.
No it isn't and I'll tell you why. Think about these experiments.
1 Let's swap the screen for an apple and see if that has any effect.
2 Let's swap the screen for a boomerang and see if that has any effect.
3 Let's swap the screen for a canvas bag and see if that has any effect.
4 Let's swap the screen for a bookshelf and see if that has any effect.
5 Let's swap the screen for a vase and see if that has any effect.
6 Let's swap the screen for a tree and see if that has any effect.
7 Let's swap the screen for a toy car and see if that has any effect.
8 Let's swap the screen for a real car and see if that has any effect.
9 Let's swap the screen for a different car and see if that has any effect.
10 Let's swap the screen for a computer screen and see if that has any effect.
11 Let's swap the screen for a TV screen and see if that has any effect.
12 Let's swap the screen for a table and see if that has any effect.
13 Let's swap the screen for a heatproof mat and see if that has any effect.
14 Let's swap the screen for a folder and see if that has any effect.
15 Let's swap the screen for a textbook and see if that has any effect.
16 Let's swap the screen for a novel and see if that has any effect.
17 Your experiment
All of these are equally worthy of consideration according to you because you don't know why any of them might have any effect. Which one do you do first and why?
The reality is that you do one proposed by someone who can give an argument idea why the change might make a difference because otherwise you'd be wasting your time. Proposing that scientists should try every possible experiment is as dumb as proposing trying to write a good story by listing every string of 100000 characters and reading through all of the \(\approx 30^{1000000}\) "books" looking for a good one. And if you're not proposing doing every possible experiment then you have to be able to explain why yours is more important than my list of sixteen.