Absolutely agreed. Stop contributing to the horrid usability of each platform by mixing and matching UI paradigms in a vain effort to create something that "fits" all platforms.

Cross-platform UI toolkits are the devil for any serious app - each OS, whether Linux, OS X, or Windows, have their own UI needs and guidelines that should be respected.

It's high time that engineers started paying attention to making their software accessible and usable, instead of focusing all their attention on core "features" that nobody can figure out, or want to.