Well, the simplest reason for not Awakening Bernice or Spica is that I don't have them. Reason I didn't get Spica from trading post is that... 1, I had several archers already; 2, I got Saki once and regretted that for a long time (though eventually I decided it'd be better to level her than Azami), and 3, I've been using my Demon Crystals for other things. Well, largely - I'm about to reach 300, but that still means I either get Spica or 2 Awakening spirits. Although I'll probably get Spica - if I Awaken more than one unit at the same time they'll be competing for EXP fodder, and at least while I wait for fodder I can give affection gifts to Spica.

Also, I too wasn't impressed with Bashira's Awakened ability. Largely I hadn't Awakened her because I like Rita more from a character perspective, and Bashira is still pretty powerful despite being CC-70 compared to Rita's AW-75 as of this posting. Arguably I might never need to Awaken her.