Why changing the dial to true zero point

I am still debating on which grinder to buy, but I’m 90% sure I’ll get the DF54.

That being said, during my research, I’ve seen a lot of people talking about the true zero of the grinder and changing the dial to indicate the true zero, but I have a hard time wrapping my head around the necessity of doing that.

Since grind size depends on the beans and their freshness, it is almost impossible to share our grinding settings between users, so if I can’t share my setting, why does it matter where the true zero is. I mean I’ll just dial my grinder and find the best settings for my beans.

Plus, having a bit of room between the dial’s zero and the true zero should give me a bit of buffer before the burrs touch, which is a good safety I think.

Am I missing something?