I created a page for each of my Miku Dollfie Dreams to my BJD family. I also made a wig care guide for Miku wigs. I intend to update it later with pictures so it's not a big wall of text.
Dollfie Dreams are not technically BJDs. They don't have ball-and-socket joints and are not held with tension, but rather a mechanical jointed skeleton. Nowadays, we would call these types of dolls MJDs. However, the earliest Dollfie Dreams were in fact strung BJDs! Although, they were made with vinyl and not resin, which made them less structurally sound than a resin BJD, that's how they came to be MJDs later. They are accepted into BJD-specific groups and loved by many BJD owners despite being a different type of doll. But it does make it a little confusing to newbies who ask, "what makes a BJD a BJD?"
While I'm rambling, let me just chime in to anyone wondering, that the reason BJD collectors distinguish BJDs from non-BJDs is that these dolls have a particular type of care and maintanance. Also, many BJDs are made by individual artists or tiny studios in small batches. So it's nice to have BJD-centric spaces to get help with their care and share information about the many sculpts and makers that could otherwise be hard to find. It doesn't mean the common misconception that we think BJDs are superior to other kinds of dolls! A lot of BJD collectors collect other types of dolls, including fashion dolls, baby dolls, vintage dolls, and of course, MJDs! ^^
Have a wonderful day~
Novalyna