Oh? And what is that? "Customization is great and you should have the option to do so"? Try having a "classic theme restorer" with Chromium.
> it may get broken again in later versions
Future changes may cause incompatibilities in any project. That is why such changes are released in major new versions so that add-on developers have plenty of time to make adjustments and fixes.
It is supposed to get Chrome extension support this year too, and if I ever had the time I'd try to expand their sync options (currently Opera + Chrome) to sync tabs and such.
I have done the move a few weeks back, and I don't regret my decision. The toolbar and my add-ons located there still work very well, also the new menu gives a quick access to useful features.
The shiny gloss over everything is still annoying, and they made the RSS icon monochrome rather than the normal RSS icon when you can sub to feeds, but otherwise I can just get rid of the menu I'd never use and have my old UX back.