A browser automation problem does not always look like a browser automation problem. Sometimes the script runs correctly. The page loads. The selector works. The form submits. The proxy is connected. But the account still behaves as if something is wrong. Maybe two accounts start seeing similar verification steps. Maybe one profile seems to remember something it should not remember. Maybe a proxy change does not fix the issue. Maybe a headless run behaves differently from the visible browser you tested manually. At that point, many teams start blaming the obvious things: The proxy is bad. Playwright is being detected. The selector is unstable. The target site changed something. All of those can be true. But before you blame the proxy, the script, or the site, check one layer first: Is your browser profile actually isolated? For account-aware automation, browser profile isolation is not a small implementation detail.…