But it doesn't make sense when you know that they have billions in cash sitting in bank waiting to be spend. They have the money and the knowledge to implement whatever feature they need to. Backend load and infrastructure scale is not a problem at this point. My somewhat simple explanation is; Google wants to cater to the casual crowd so hard to the point of sacrificing user experience for advanced users or power users who use YouTube every day. They rather prefer status quo than try to bother with more advanced features. But I have to admit, they already have some pretty advanced features but they need to keep pushing.