I'm a simple soul, if I can't measure it really easily I don't worry about it.
It's not like any two beans are the same and I'm tamping them by hand anyway.
Worrying about the shape of the blades in the grinder is like worrying about the type of power cable on your hifi amp. It's too much connoisseurship for me personally but more power to you if that's your bag.
Spread a small amount of ground coffee out on a piece of paper. Observe the varying sizes and shapes within the grounds. Better grinders produce more even grinds which produce more even extraction during brewing.
It’s an exceedingly simple concept. As an extreme example try and brew an espresso using a simple blade style ‘grinder’. It will be impossible. The refinement of a good grinder is simply optimizing along this axis.
You like what you like.
I'm just saying that your dismissal of the effects of your grinder are very wrong. And the differences are easy see and measure.