As professional logo designers we are certainly happy about the current “flat” design trend in terms of icons, and web design in general. While at first this may seem like a passing trend, a company logo, over time, generally goes from more lush and illustrative to more simple and iconic as the brand matures. Google’s current logo redesign is a great example of this. Much has been said about this logo redesign pro and con, but this redesign was done for great usability across all platforms.
Long before mobile and small icon had to be considered, real designers have always designed the logo from the ground up, to still be read in a stamp-sized format, and also work in one color. Those two basic rules predicate almost all design issues that could later come up in terms of real world usability.
Here is a good article on several recent brand marks that have been redesigned lately. The reactions to all have been mixed, but one thing you will tend to see in common is that they have been simplified. For example Spotify’s drop of the gradient might seem trivial to someone outside, but not someone on the inside driven by efficiency. The faster the logo loads on a mobile page will mean real numbers for any company. Our job as professional designers is to make sure the aesthetic of the design is improved, along with usability when developing the logo in the first place.