She used Drax’s strength because that is the one she actually had access to at the time. G’iah does not just snap her fingers and pull Hulk or Thor out of thin air. In Secret Invasion the Super-Skrulls have to harvest DNA or get close enough to copy specific abilities. Drax was one of the people they had already gotten samples from. Hulk, Abomination, Captain Marvel, and Thor were not sitting in a lab waiting to be copied that day. She went with what she had. Drax’s strength is still no joke. It is raw, biological, and more than enough to smash through most things in that moment. Using a power she already possessed instead of waiting for a stronger one she did not have yet is just practical. People act like she had a menu of every Avenger sitting in front of her. She did not. She used the tool that was already in her hands.
This was where I realized that I can skip some Marvel projects.