To be honest, I did find it weird that the rime movement excluded the Gelugs in the first place, and isnt it that the Gelug school is actually Rime from the start, since Tsongkhapa actually took teachings from all the traditions of his time? It didint really occurred to me that Rime was actually created in response to the popularity of the Gelug, where Tsongkhapa has always emphasized on following the system where the Buddha has taught - focus on ethics, Guru devotion and on preparing the ground well before entering the path of Tantra, something that was not emphasized during his time. So, in other words, Gelug is a more systematic way of rime. No doubt that the movement united other schools, but it also caused them to be jealous of Gelug and they also spread a very dangerous and poisonous mentality that being just with one tradition means that you are sectarian. In fact, the Rime movement sounds very good at first, until we discover how and what are they doing to the Gelugpas.
I do not think that it is "wrong" to seek teachings from other traditions if we are Gelugpa, but it is wrong if we do not have a stable foundation in our own tradition before we explore another, or do it without the permission of our own Gurus. I am sure it is not an issue at all if we have mastered the Gelug lineage and all the teachings in it and then we seek teachings from Sakya, Kagyu and Nyingma, but so far how many people is able to do that? As a Gelug, I do learn up on other lineages such as their histories and a summary of their practices, but I do not see the need to partake in their teachings simply because I already have a lot of teachings and practices I have yet to study and practice in my own tradition, so why do I need to seek other teachings when I cant finish my own?
The current idea of nonsectarianism actually originates with Rime, and perhaps people misinterpreted it, or perhaps it is an idea that stems from insecurity, as the quote below shows?
In the West, where so many different Buddhist traditions exist side by side, one needs to be constantly on one's guard against the danger of sectarianism. Such a divisive attitude is often the result of failing to understand or appreciate anything outside one's own tradition. Teachers from all schools would therefore benefit greatly from studying and gaining some practical experience of the teachings of other traditions.[16]
Does anyone here fail to appreciate Dzogchen or Mahamudra? Or the masters from other tradition? I dont think so. we just dont do any of their practices. thats all.