steeldragons
Steeliest of the dragons
If the definition of "Engage" is creating an immersive experience. If a core book were, and I'm not saying this is the case, nothing but crunch - is there an engaging experience?
It seems to me that you have to at least has some story and world flavor in order to even attempt to "engage" someone.
Am I missing a component of engagement when it comes to Crunch?
I am in agreement with [MENTION=32536]TwinBahamut[/MENTION] that is could be. As TB says, "depending on the person".
Despite a well thought out reason (that rules/crunch for a game are necessary), I do disagree, however, that it would be/provide an immersive "engaging" experience for the majority of the target audience.
No matter how much or how little one takes the crunch into account for one's game, the crunch itself is not engaging...unless you are one of those people who likes fiddling with the math and the numbers.
I think Jon has the right of it, that some kind of flavor needs to be presented to spark the imagination and desire to play moreso than the crunch. My imagination is not going to spark because I have a well presented/thought out page of mechanics telling me how to swing my sword and how much damage it does and what I can add as a bonus to that damage. There's no imagination there, no creativity, just a bunch of numbers to tell me/solidify the abstraction of the scene.
Some of the abstraction needs to be presented, in story v. game form, to make the mind wander and wonder. So, yes, I see story and flavor as essential to generating an immersive/engaging experience with the material.
But, again, that's me...and so I suppose my counter-position to TwinBahamut is no more or better than "it depends on the person."
That said, it would seem that, unfortunately, again, this is an element where that golden "middle of the road" is necessary...and naturally, that amounts to "you can't make all people happy all of the time." Somewill claim/complain that it is too fluffy/flavor oriented without enough crunch where they'd want it. And, some will complain there is too much crunch and mechanics without enough flavor to engage them. But all you can try to do is get close to the middle.
As with, well just about every thing/topic concerning 5e, it will really just depend on who's viewing the product and what resonates, personally, with them as "Engaging."
Good luck.

--SD