[cringepirate]

I am certified with Sitecore 6.5, However I haven't worked with it regularly in over 4 yeras so things have probably have changed (I've heard Sitecore 9 is very different than 6-8).

One of the problems with the WYSIWYG editor was that the developer effort typically added and extra 50% effort onto any task and like anything with Sitecore you ended up having to dig through PDFs on their development portal.

A slight aside though. One of the best things about Sitecore was its OOP approach to content. Every piece of content was an instance of a template. If you knew what you were doing with it you could build things very cleanly. I haven't seen anyone else implement anything similar in their CMS.