I have worn my DD facing out time to time with Baby Bjorn (from 3 to 7 months old) and she LOVED it. I don't think it's evil to use Baby Bjorn or to have baby facing forward. At the same time, I don't think they NEED to be carried facing forward. You just have to go with what works for you and baby, not what others do or say you need to do. Obviously, if your baby gets overstimiulated, don't face forward. If your baby's posture ends up funny, don't face forward. If your baby always wants to see what's behind her away from you, try facing forward, etc. Go with what your mama instinct tells you.
The most important thing is keeping baby happy!! :-)
Specific instances where outward facing was really useful/fun were...
1.in front of mirror
We used to play peekaboo and games in front of the bathroom mirror. Also, I acted as a doorway bouncer of sorts with her so she could stand on the bathroom counter to practive standing/walking motions.
2.getting to know grandparents/relatives
At first DD didn't want to be held by relatives but I got tired of holding her JUST SO, so that she participates, wouldn't cry and relatives won't be tempted to take her from me. With forward facing Bjorn, problem solved!
3.Nature museum/Aquarium
DD gets great view from forward facing bjorn and really liked not having to turn sideways to look at fishes and animals.
Instances where I would NOT carry DD face forward...
1. Mall/ store
Just too tempting for people to come up to you and touch her, etc. No way! I usually carry DD in front of me and facing in, plus one hand on her in a protective way.
2. Any place new
DD can take in the new surroundings as much or little as she wants this way. Surprisingly, one of the new places we went was our backyard! She didn't know about it until she was like 3 months old and she was kinda scared.
Now she's outgrown Bjorn and we have Ergo, which we LOVE. She doesn't seem to miss the outward facing. But then again, now she is crawling and pulling up so she does more "face on" exploration on her own. We don't really do hip carry that much on Ergo, but that would be similar to face-forward carry. Honestly, I would not get a new wrap/carrier specifically for the face-out position. Sounds like you have several that you and baby likes, so then you're all set!
My two cents about Bjorn vs. Ergo - they both have their pros and cons. Yes, Bjorn holds baby by their crotch but holds baby straight plus nothing cuts across her face like Ergo straps. Has neck support. Ergo holds baby better by their bottom but always makes DD twist her neck and torso side to side (No, she doesn't like looking straight into my neck). Baby legs in splits! No neck support (DD loves to hang her head way back in back carry and hood doesn't work when she is awake). Which is better for spine health? Which is better for baby posture? I say it's a toss up and we LOVE both.