I agree, you summed it up perfectly. I will only add a small observation and a short remark. There are, indeed, "only kinds of enlightenment" when it comes to realization as in manifesting. The realization as in knowing is identical no matter the path.

Thus, I don’t try to argue that secular path to knowledge is somehow less profound — it has the same validity as other paths. It is merely incomplete. Sure, there is solid philosophic background (jnana), and we also have Jungian, transpersonal, or behavioral psychology that yield similar results as devotion (bhakti). Secular path, however, lacks a “standardized” alternative to meditation and concentration (raja), and ethics as well as other secular “guidelines for living” (karma) feel like they are still stuck in chaos.

Now, these four domains are all essential because they interoperate and reinforce each other. Acceptance attained through bhakti leads to easier execution of karma, clearer jnana, and sharper and faster raja which enables continually go deeper and deeper, because more refined raja also allows observation of more fleeting perceptions (thoughts, emotions, noises, etc.) to fill in the blanks in jnana. Karma in the beginning serves to create external conditions that create life circumstances propitious for pursuit of knowledge and in the end is self-evident — it’s no coincidence that all spiritual traditions contain the same set of five don’ts: no killing, no adultery, no stealing, no lying, no coveting. And the circle closes when expanded knowledge inevitably leads to expanded acceptance.

Then, eventually a breakthrough happens.

Depending on how much unprocessed baggage one drags along, it takes some time until the realization settles (so to speak) because at that point the sub-conscious realms are wide opened. It’s also the reason why the popular image shows a monk for years sweeping the stairway leading to the temple or an apprentice undergoing crazy training regimen before the master finally pushes him over the edge (either directly or through a quest). Those folks settle in their realization immediately because they have their ego, but basically whole mind, already under control.

But yeah, it has nothing to do with limiting the existential, emotional, or any other depth. Quite to the contrary.