No worries; as far as I'm concerned, we're all here to learn amirite.
Actually, a lot of people still argue about the degree to which heat/fast-charging hurts lithium-ion batteries--we all know that li-ion batteries get worse over time, but it's starting to look like USB-C fast-charging might actually be making the problem worse due to the amount of heat that 3A is guaranteed to generate. Throw a protective case into the mix & you've basically got a Li-ion-filled hot pocket. Phones are supposed to have thermal regulators to counteract this, but I have a Pixel 2 and it's pretty obvious that this is only so effective.
I think we all know on some fundamental level that you can't get something for nothing (especially when it comes to physics), but fast-charging claims to be doing exactly that. Until modern battery tech improves, it's likely that the balance between overall battery life and charging speed sits somewhere between 2.1-2.4A. (ಥ_ಥ)