What was the decision beside changing behavior of
render method to allow not only single elements (or passing tree below)? I am pretty sure that this option will be used too often.
Component should be a single node, otherwise it makes big mess while composing them - especially when you prefer to have single responsibility, separating cascading styles and DOM structure.
Obviously this option is pretty good as workaround for various stuff, but makes much harder preparing efficient algorithms or making code more predictable.