Okay real talk.
We all hate what happened. It was horrible and we all love him. But let's talk about it from a story writing standpoint.
Tech from the beginning of this season has been trying to show his love for his family in the ways he knows how. In Ruins of War, he showed it by perservering to help Omega and Echo even through a painful injury, which is very in character. In Faster, he showed his loyalty to not only his family but Cid by competing in the race. In Truth and Consequences, he helped find the information to help ALL his brothers. The Crossing showed him jumping without hesitation the moment he saw Omega in danger. And then he told Omega "I may not process moments and thoughts the saw way, but it isn't mean I feel any less than you do." Also he was the first person to say hey needed to go save Crosshair.
All of these inherently small moments show how much Tech loves his brothers and sister and his care for them. Tech's love language is sacrifice.
He sacrificed his safety multiple times to help and show his family he cares, he sacrifices things he wants to do to make his brothers and Omega happy.
He sacrificed his life to show his family he loves them.
Tech's character arc this season shows that even though he isn't affectionate, he loves his family so much.
