This sort of doublespeak seems not uncommon amongst browser vendors lately, and Yandex is no exception. They run a search engine just like Google, so they also want to encourage its use instead of URLs. The difficulty of entering a direct URL with this browser and deemphasising its presence is no doubt a deliberate decision in this direction, and meanwhile they divert attention away from this by emphasising all the
non-functional eyecandy.
These are displayed on an animated backdrop, with very little other interface furniture to clutter up the look and feel of the page
By convincing users that anything other than what these companies want them to see/use is "clutter" and "distraction", and therefore unnecessary, they can achieve better control over them. As the saying goes, "out of sight, out of mind." It's both sad and a little amusing that they're basically saying implicitly "we removed all these things we thought you won't ever use... but you can have a pretty picture to look at."
The "modern web user experience" is all about taking control and freedom away from the users - giving it to "content providers" - and conditioning the users to like it and accept it complacently. I think it's the exact opposite of the ideals of the web.