We don't need AGI to have transformational AI that is extremely disruptive to our civilization. With some improvements LLMs threaten to make a lot of people's white collar jobs redundant. We've also seen AI doing things like flying jet fighters better than people, drone AI, all kinds of military applications, the boston dynamic robots to replace manual workers. None of these qualify as AGI but AI doesn't need to be sentient or truly conscious in order to

(a) potentially self replicate if properly set up for it (b) centralize a lot of power in the hands of a few