Personally, I left most of the imprints. The techniques are around equal in power level IMO, so if you get one you can just use it.
I'm currently hoping that, in the future, we'll be strong enough to speed up the grind significantly.
Viewing post in Cycle of the First Dawn comments
Currently all the wilderness tiers contribute to the imprint find the same way, hoping that in the future the deeper you go the easier it becomes to find one. Techniques are cool in concept but I think we just bulldoze everything through power level anyways so they are just a niche completionist goal.
The initial versions did give an increase to imprint chance when you were in the Inner Wilderness, but that ran into the issue of only triggering at the start of the Wilderness life, so it was a one chance (whereas now you can get multiple imprints; once I was lucky and got three) and the bonus was irrelevant for Inner Dual, since you couldn't enter them directly.