It stopped being centered around gender dysphoria quite a while ago. Gender identity is where it's at now, and the idea that one does not need to be dysphoric to be trans is currently the most mainstream one.
Yes, you do not need to be dysphoric to be transgender, however. It is actually quite difficult to compare rates of gendery dysphoria to transgender identity, as transgender identity is inherently self-reported, but studies on gender dysphoria focus on diagnosed cases, not undiagnosed estimates. Therefore it is also not possible to assert that non-dysphoria is dominant among current transitioning people as you do.