Claire actually has a use due to her uptime and anti-armor. At close to max SU and AW status, she can actually challenge Bashira when enemies have a bit of def (which will get pretty common at later stages of the game). I have experienced the difference between AW claire and bashira personally during Majin Vepar Lv5 myself on dmm (way too far ahead, honestly), and while her use is honestly minimal for veterans (just like Misha), it's not worthless in the long run to level them as low~mid priority units.