I keep reading that people wished for the creators to spend more time with the six core romances rather than adding two more to make things unbalanced. But, here is a question...why should they spend more time with the six core romances if they feel they are developed enough. If you put too much effort into one area of the story, then it's either going to get redundant or overshadow the rest. In the case of the romances, the romance part of the six characters may overshadow the friendship parts or even their own personal arcs. So, I feel they went with another idea: bringing in two people to be romanceable that actually makes sense. If they say Vivienne not being an LI makes sense story-wise, then there must be a reason. Same with Varric, Morrigan, and Leliana. If there were good reasons why they couldn't be romanced, but there were good reasons that Cullen and Solas COULD be romanced, then I say they should go with it. They can't put too much focus on the romance of the core six without it overshadowing something or making it redundant.
And, as a fan of Cullen and I may be selfish to many for saying this, but I am glad the devs took the extra time they had to make him romanceable. If they didn't, I won't lie; I would've been disappointed. I would've just think of other ways to try to enjoy with what I have with the two males I would romance. But, knowing I have four, I will take advantage of it now rather than throw this opportunity to the side. Because I feel I may not get this many options in the future...or any at all considering the reactions to the romances.