It's because a troubling number of players are ridiculously overly invested in fictional characters and worry far too much about what people they'll likely never interact with do with their free time/want out of the game.
I'm fine with Cassandra being straight in-game. Yet if someone wants to design a mod to make her bisexual or a lesbian in their game? I really couldn't care less since it doesn't affect me in the slightest.
Heck, I'd be happy with a mod to make Cullen bisexual as originally intended. It wouldn't affect anybody else since they wouldn't be the ones invested in my play-through.
The problem starts when people start making distinctions.
It's "okay" to make Cassandra and Cullen bisexual because that's somehow pro-LGBT,
but not okay to make Sera available to male PC because that's an offense towards Lesbians.
People need to start minding their own business. Almost every mod is legitimate. (unless you go *really* crazy)
Everyone should be able to enjoy their SP games in the way they want, after all, that's what SP games are all about.
Mods are an incredible phenomenon and this condescending and judgmental (not to mention hypocritical) attitude that some malcontents have adopted with religious fervor - is ruining everyone's enjoyment while at the same time marginalizing legitimate causes as unreasonable and offensive.
At this point the whole romance thing became so tainted with BS gender politics propaganda, that I half wish to see it scrapped entirely.
There are other areas that could use the resources invested in this.