Yes, the benefit is definitely the habitat count limit, plus the psychological benefits for the dragons of not being alone. I'm still worried about Dozer, Fruition and Demolition - it isn't healthy! Hopefully Flatfoot is giving consideration to that question. There definitely needs to be a Mrs Fruition and surely Dozer and Demolition could have shared accommodation?
Now I just need to be able to put Peacock and Blue Peacock together, plus Prime Chroma and Prime Eternal together, then I'll be happy. We need a habitat that can take ANY type, for those of us that like to have happy couples!