Thanks for excellent post.

I like Dotnetnuke and if I'm not mistaken supports all the features that Umbraco, Kentico, Sitefinity & site core have including support for mobile, load balancing,multi-lingual support, WYSIWYG editor, blogs, workflows, newsletters, full-text search, online modules, web analytics and eCommerce!
It has a rich web API and can easily support multiple frameworks like Angular 4 and others. Definitely a sound choice IMHO.