Cults become cults in the BITE model sense because they are different and "persecuted". Once they become mainstream, they let go of the cult characteristics and become a healthy church, but at the cost of losing their "non-mainstream" views.
I'm not 100% sure that it's that cut and dry. First, I haven't heard of any high demand, controlling group, such as cults, that has made changes to become a mainstream religion. In fact, one of the characteristics of a cult is precisely that they choose to diverge from mainstream religion, and their "out of the ordinary" teachings attract people, which becomes their signature.
As an example, I don't think that the word "disfellowship" is going away any time soon from the WT, just like the word "defoo" will be retired from another cult I know uses that word.
Cults don't "lose their mainstream views", their non-traditional views is one of their core characteristics. Some organizations evolve into cults, but the opposite hasn't happened (as far as I know).
Could you think of any christian denomination that teaches non-mainstream stuff and is NOT a cult in the BITE model sense?
My sister in law and her husband are involved in this Christian organization that has had some non-traditional events, one of them in a theater. It was explained to me second hand, but as I understand, they asked people to take their shoes off and leave them in the theater and return to their homes barefoot. Not sure what the point of that was.
Non-traditional practices do exist in mainstream religious organizations. As per the BITE model, the difference is not the B, I,T or E words, but their modifiers which is one word, control. Many things can be done in the spirit of providing healthy spirituality to people, for as long as there's no intention of controlling, as you state, I see no reason to see them as unnecessary.
And of course, please keep in mind that all the things in the BITE model occur to people once in the cult. People don't submit themselves to control voluntarily (I mean, under normal conditions). People always neglect to consider why many people actually join those groups, which have everything to do with what they feel, not with what they know. When they join they know nothing, but feel something.
Also, I'd like to ask, if I may:
Christadelphians? Cult.
JW's? Cult
Mormons? Cult
SDA's? If they are strict, Cult.
Bible Students? Cult
Iglesia Ni Cristo? Cult
Two-By-Two's? Cult
Christian Scientists? Cult
Worldwide Church of God? Cult
Where does that come from?