romances in games do nothing but derail the main focus of the game. it would be better if they just leave them out completely.
Ridiculous.
Dating Sims are games, and romance is the main focus of those. You can't take it out or there is no game.
Your statement only makes even the slightest lick of sense if we assume the gameplay of all games revolves entirely around killing people, which is demonstrably false.
All you're really saying is that the romances aren't an important gameplay aspect to you. But people find a wide variety of things to relate to and derive entertainment from in video games. Any one item can be thrown out and you could see obviously that that has happened in other games, if you spent even two seconds looking into the vast array of games that exist.
What most people I know that play Dragon Age say they love about it is 'rich character development', and romance is definitely a part of that. It's easy to see how it could be one of the most important elements, if you're not taking an extremely self-centered stance.
And any good business realizes that a well rounded approach is the best way to net a wide range of customers and hedge their bets, overall. They don't want to to narrow their field. That would be dumb.
Romance is the only reason I ever picked up a Bioware game in the first place. If all I wanted to do was kill dragons, I would've stuck with one of the dozens of games I already own that have that feature. I give my money to Bioware because they offer me something more. And yes, that something just happens to be the freedom to kiss other boys, and being a badass while doing it.