For example, realizing the selflessness of phenomena has very little to do with Metta, in the traditional Buddhist model. Certainly, it has much to do with the selflessness of beings--who are a type of phenomena, in a sense. but when we talk about external phenomena, there's very little use for "love," I'd argue.
You say that
about "peering into the void."Even with metta, it is still damaging to the energy within. Not something to be taken lightly or something for anyone less than adept should even consider imo
The traditional Buddhist model, in contrast, talks about the experience of emptiness as liberating. Certainly not damaging. Though if one is attached to one's ego, the ego will certainly feel it to be "damaged."