The article is clickbait, I think. While there is a vocal subset of OnePlus users that dislike the change, their own poll they cited says approximately 60% of users approve or were taking a "wait and see" approach as of 8 months ago.
I have OnePlus3 as my main phone and I am still quite happily using it. However, as the manufacturer has changed their target audience, my next phone is not going to be oneplus.
Sad thing, it is pretty hard to find a decent phone which does not have crap pre-installed.
Except no one is voting "now", they voted nine months ago and now this post is making an entire article centered around that vote.