@metodrybar @joelle Breast augmentation is reversible, whether it's done for a cis person or a trans person. I know cis women who got mastectomies and then breast augmentation a few weeks later, covered by insurance both times (usually as a treatment for breast cancer, in which case it's also followed up by an anti-estrogen, the same drug that politicians call "puberty blockers.")
On the other hand, I was a toddler when I got my adenoids removed. That IS irreversible.