The whole point of Ultra Magnus’ character development is to move forward from that “two expressions” point. Every single panel given here happen after he confided about himself.
i agree with you, but not entirely, while he definitely became more expressive afterwards he didn’t have only “two expressions” i included only expression from later because he is more expressive, which i think is also due to a different artist (everyone became more expressive) but here are a few pre-talk-with-swerve expressions:
^ this one is just so adorable!!!
our nerd always was and always will be, a nerd.
Rung: What’s upsetting you?
Rodimus: He always uses common phases incorrectly!!
Ultra Magnus: Cry me a table, Rodimus..
Rodimus: *facepalm*
Rung: …*Giggles* xD
remember the time in transformers:prime when jack saved the day by making the decepticon’s warship spank megatron?