Atom is a small bit slower than sublime, but it has just as many or possibly more plugins, has a nicer settings and plugin interface, and is open source and free.
I switched to Atom a few months ago, and I agree with all your points, but I think you're being a bit generous calling Atom "a small bit slower". On my machine (2013 MacBook Air) Sublime opens instantaneously, while Atom takes 2-3 seconds. Opening files is also noticeably slower, though not by as much. Memory usage is also far higher, in the hundreds of MBs vs tens.
This has been my experience as well, in addition to an increase in energy use.
Me too. I poke at Atom every few months — but speed + battery time are why I'm currently sticking with ST.