I'm not really a Dzokchenpa, so perhaps not even qualified to say anything here....but I have enjoyed this thread, and have been involved in conversations that are quite similar, from a Mahamudra perspective.
Of course, I've read some Dzokchen materials, and even practiced (or dabbled in, rather) sadhanas associated with Dzokchen--Konchok Chidu's Guru Shiwa, and LongNying Rigdzin Dupa, as well as Chogling Sangtik Purba and the Riwo Sangcho practice, to name a few.
Mahamudra has a tradition of practice based on Shinay and Lhaktong, which we could consider methods apart from "tantra." But at some point, there is "Pointing Out Instruction," and from that point on, if one "gets" it, the main practice consists in resting in the nature of Ordinary Mind...or, rather, attempting to rest in that. It strikes me that some here are advocating a sort of "Dzokchen practice" which resembles this. (I could be misinterpreting this though...)
The most widely-stressed "technique" in Mahamudra tradition for finding or re-finding this state is Guru Yoga, which is tantra. But there are also the stages of Creation and Completion, which serve to foster recognition and recollection of the state through various means, some quite powerful--thus, you have the Six Yogas, etc. These practices are not "essential" to practice Mahamudra....but at some point a practitioner realizes that "abiding" is not as easy as it sounds. Stores of merit, purification, and other skillful means then become the aspects of effort on the path.
I've met practitioners of both Mahamudra and Dzokchen who talk about "Abiding," "resting in the View," or other such terms, and express the view that all other methods and techniques are merely "adjuncts." Of course I can't judge their states of mind or see within them to determine to what extent they "abide," but their assertions and statements are often made with an attitude of pride, or dismissal, or arrogance....or so it has seemed to me. Where there's smoke, there is most likely fire, in any case.
We have to be honest with ourselves, first of all. If we get upset, or under the sway of the poisons, clinging, aversion, etc., that's a pretty sure bet that we have work to do. We're not "abiding" in anything that we should be "abiding" in, and our time would be better spent working with the methods that have come down to us through the great lineages of Mahamudra and Dzokchen--and those methods definitely stress things like ngondro, yidam practice, and other skillful means.
"Absolute Truth is not an object of analytical discourse or great discriminating wisdom,
It is realized through the blessing grace of the Guru and fortunate Karmic potential.
Like this, mistaken ideas of discriminating wisdom are clarified."
- (Kyabje Bokar Rinpoche, from his summary of "The Ocean of Definitive Meaning")