It's a huge whiff that they didn't choose to go with WebKit, contribute back, and provide a unique interface juxtaposed to Safari. I like Arc, in principle, but I hate how wasteful Chromium is with a computer's resources and the idea that it should be an operating system on top of your computer. I want my web browser to just... browse the web and not launch background processes and all these weird things that the web wasn't originally designed for.

Or even Arc with pluggable rendering engines. A power-efficient, battery-sipping version using WebKit would be a dream come true.