理解“X%规则”之外的头寸规模

This makes so much sense! So, if a stock is super volatile, even if my dollar risk is the same, my actual share count would be lower because my stop loss would naturally be wider? I'm still trying to get my head around how volatility and stop placement directly interact to determine the final share number.

This is a great point. It's easy to oversimplify, but adjusting position size based on an asset's typical movements and where your stop needs to be is key to making that 1% risk truly mean 1% of your capital, rather than just a fixed number of shares.