Holding hands with Catra is going to important to Adora's peace of mind. Because during the war, 1) Catra's hand had always been out of reach for her 2) Adora's world always crumbled by unreality and mind games before she could hold on
Holding hands used to be their thing since they were kids, during trouble making with adults, playing, helping each other out of falls, reaching out and holding the other's hand for safety in an abusive society.
Until Catra felt betrayed, and for the first time ever she yanked Adora's hand away, to Adora's shock.
In Promise, the castle of her ancestors took Catra from her, its traps and mind tricks yanking Catra from Adora's grasp, pulling Catra through a mirror and out of Adora's safe hold, and ultimately leading Catra into refusing to offer a helping hand like she used to, and severing their past.
After their friendship was severed, Adora tried to reach out again. And it was rejected by a broken friend in a fake world.
When she finally had the chance to reunite with her oldest friend who she loved and missed, not the bitter enemy she could barely recognize, Adora reached out, this time Catra's hand reaching out for her, too. But that hand was forcibly snatched away before she could touch, and she helplessly watched Catra fall into the abyss. Where she lost and grieved for her.
After Catra ran away due to their abuser's mind games creating a rift again, Adora had wanted nothing more than to have her back, and she manifested this desire in that castle that had once severed their friendship.
But once she reached to touch Catra's hand, she touched nothingness. It was another mind trick, made to get Adora to fall into the abyss and fail to deactivate her ancestors' weapon.
As she died, she wished for something Mara had asked her to wish for, and that was a future with Catra.
She saw Catra offering her hand, and she felt total happiness, fulfillment. But, again, once she she reached for Catra's hand, she touched nothing, and realized it was just a deeply buried wish.
This almost broke Adora, up until Catra reached for her, like she used to when they were cadets, to save her.
Adora literally clung to life because of that hand, manifested from a desperate "I love you, so hold on!"
The show ends with Adora offering her hand, and Catra accepting it, for good.
And that's why I think Adora from now on will seek out Catra's touch often, because she was plagued by unreality and mind control four times into thinking she had lost the one she loved forever. And her touch and its permanence will be her anchor.
