Yes, it's an old topic now at six pages in length, but we might as well keep it alight in case the developers ever consider this thread as worthwhile.
In addition to the bland, mistaken (IMHO) look of the *etro GUI, CCleaner has a number of serious deficiencies, in my book. In Microsoft's book too, I might add, given that CC has broken a large number of Microsoft's design rules - rules that have evolved to the state they're in for good reason.
The FPS look - Flat Paper Shapes - emerged for a reason that can be summed up in one word - batteries.
As touch-tablet devices developed, it was found that overlapping windows and shading cues demanded far too much energy to display and control, so FPS was deemed the interface that would take the least amount of power while providing a usable and interesting experience. What drove the benighted executives at Microsoft to insult and ignore the gigantic masses of existing GUI users of XP, Vista and WIn 7, we may never know. They're probably all now contemplating their own thought processes down on river banks somewhere, fishing, having been swiftly separated from such further potential folly soon after Nadella's arrival.
For 90%+ of the world, the change to FPS wasn't necessary; indeed, it was quite unnecessary. And Microsoft is reverting, as we speak.
Yet, amid all the trauma and strife, here we are presented with the FPS interface in CC - and it still doesn't incorporate the functionality of a menu/ribbon (hidden or not), a Help facility that reacts to F1 (established as standard before Lotus 1-2-3?), the slightest hint as to what a cue or control within the interface might do (hover-over tips, perhaps?), disambiguation of the list items ..so as to give confidence in choosing, contrasting colours in text, an Exit (gracefully) control (wha!), and the most fundamental reason for its existence - cleaning up space - presented in type large and obvious enough not to require squinting: '999 MB to be removed' (saying nothing of the grammar) - after the Analyze run.
As with the *etro interface, and the decision to impose it upon the world, CCleaner has become an ugly beast, albeit one that does a job adequately-to-well. But we should be able to hope for something different, to better, surely? I step around the interface tentatively even to this day. S Jobs, Esq's mantra was that the program should speak its purpose 'out loud'. Intuitive. Not here.
Until the developers react, our only option is to avoid buying the product and search for alternatives. In that regard, the convoluted offer of a free or discounted purchase last year was a disgrace in the annals of marketing, IMO. I, for one, wish for more.
2/c