Personally I didn't mind this feature.
I hate juggling accounts, I hope this doesn't mean I'll need a YouTube account AND a gmail account.
Personally I prefer having separate accounts. It's too easy to track down information with linked accounts. People don't realize how much information is publicly available and what consequences that can have. Heck, even without linked accounts it's far too easy. I once tracked down someone, at their request, starting with only a username on a single forum. On that forum they'd mentioned their cats names in a single post. From that I was able to identify their postings as anonymous users, their real name, address, social media profiles, and so on. The scary part, it took me less than an hour to compile all the information. The only reason it took that long is because there was a lady in Florida with the same cat names which had to be teased out of the data. Another individual I tracked, I was able to identify where they lived, what they drove, how long they'd lived in their home, what they paid for it, what they pay in taxes, what instrument they played in a band, etc... so many details of their life just out in the open. I got all of that starting from a single tweet on an account they'd only sent 8 tweets from and deleted; it just happened to have been cached by Google.