I get why you’re upset. Just to clarify: the default doesn’t wipe cookies, it only clears cache. Losing logins would happen only if “Cookies” was enabled in options. The current default is cache only + current tab, but the time period is “all time.” You can switch it to 15 minutes in Options.
I also have long‑time users who prefer a full clean by default, which is why I kept “all time” as the default. Still, I’m open to adjusting it if most people want 15 minutes.