You're right. DAI should have only had 4 romance options, 3 of which are accessible to any one gender at a time. Offering 8 options, some with more limitations is a fundamental betrayal.
If those four romances are better fleshed out than the eight they're giving us, then yes. I have a feeling that some of the characters that they're dangling in front of us are going to fall completely flat. The DA:O romances were very well fleshed out even though some people did the "Oh gifts and love me" routine, and the ones in DA2 went quite well because there was already a founded backround of information on at least 2 of the characters you were allowed to romance.
That left three wild cards to learn about, which was a good mix of the new and the old. The only one currently that you can say you've actually had dealings with in any regard is Cullen, Cassandra was in her own movie, yes, which means she's a known quantity but you as a player only got to see her in cut scenes with Varric.
I may only be speculating as well, but that's what all of us are doing currently. We're only seeing the portions that we're being allowed to see and making judgement calls from that. By locking people out of romances, you don't let the player really make any decisions. They may be good romances, yes, but they still shouldn't just go "Nope, not happening, not going to work. What time is it? Not going to work o' clock." The best part of a romance story, novel or game quest line is the trials and tribulations of getting to that pinnacle, I had a lot of fun working my way through as a male mage to get Fenris to do the "Dance with No Pants" because it was a good dialogue set but it wasn't easy and made it worth it.