Somewhat interestingly before you'd go from getsentry.com --> app.getsentry.com during authentication, whereas now the domain is the same (i.e. sentry.io/welcome --> sentry.io).
I wonder if this simplifies tooling around analytics, since now their logged-out domain matches their logged-in domain.
If anything that makes everything more complicated. However the upside is that it's less to type now and a bit less confusing for users.