[un_pogaz]

That a No for me. A angry No.

Is kind of you, but this proposal is just (another) flat version of the actual. Personality: 0.

The actual one is very good. The actual Calibre text is great: is gilded, shiny, raised, looks like it's made of gold, sweet. Yours... is just a flat yellow...

And for the task bar (which is also the main logo), you propose to replace the historical 4-book side-by-side, as if it were stored on a shelf which corresponds perfectly to Calibre's library function, by a poor letter accompanied by a small book so stylized that I had to look twice to understand its meaning... No. No no.

Forgive my colelery, but: A hate this trend of flattering logo, refusing to create detail and personality.
We don't need flattering. Flatterers think we're incapable of retaining and recognizing shape with a little of complexity. That we're dump morons, in fact.
IS TOTALLY WRONG.
We are capable of identifying the face of another human being. 500 different faces according to some scientists.
A logo doesn't need to be simple; it needs to be iconic, identifiable at a glance. And if we can add a few details and embellishments to give it depth and personality, all the better.
And your proposal don't do that. It just erases all personality and individuality, and makes it look like any others flat logo, without standing out in any other way.

In fact, I'll be even more precise in my anger:
Calibre has already had a Flattering. In version 2.71, I remember it because I didn't like it at first. But I'm forced to admit that it made sense, because before Calibre didn't use logos and icons, but images that were too complex for what they symbolized.
What you're doing here is OVERflattering. Beyond what's necessary.