I think what Eric was talking about was, that Icinga Web 2, Director and Icinga 2 are the things we would consider the “the standard package” or “core package”, from which the modules branch off
So yes, Icinga 2 does the essential thinking and checking, but the web also does much more than just displaying - with all of the modules at least, which serve as an extension to the Icinga Web 2.
Technically when you @bodsch speak about the Icinga Core, you’re talking about Icinga 2 (the term ‘Icinga Core’ is not really any official name)
And yes, I know we do use it ourselves as well - sorry, for being a sticker upper
Hope I helped clear up the confusion instead of creating more
Have a nice day,