You are right -- I don't really remember when I had to login with different credentials for Youtube, et al. Just to clarify, I am making a distinction between

You are right -- I don't really remember when I had to login with different credentials for Youtube, et al. Just to clarify, I am making a distinction between being able to sign into a Youtube profile with a Google account and forcing the same profile across all Google properties. Judging from my preferences, and based on my (limited) anecdotes, it seems that users appreciate the convenience of single-signin solutions, as long as each property they are signing into has a profile that can be managed separately.