As far as I can tell T makes you bald, angry, and hairy. And gives you cancer.
Yeah but if you don't mind bald, hairy and angry it's got to be empowering. Getting physically stronger, putting on muscle, passing as male (not always but more than MtFs do), interesting hair growth in weird places - you can see why they feel the need to document every hair that sprouts on their scarred chest because testosterone does foment some drastic changes in a person. In a man, the supplementation of T can make them twice as big as they would otherwise have been from working out, in a woman it can completely transform her, as described above. I always found it very odd watching dyed in the wool lesbians cheering on "male puberty" in a trans man, celebrating what they find unattractive, forgiving the teenage outbursts, and in some cases allowing speech they'd happily get a man sacked for. Some swaggering FtM yelling "where's my bitches?" is pretty cringey, and don't get me wrong, I know how cringey butch lesbians can be too. Our approximations of masculinity are sometimes as far off the mark as a pornified AGP's attempt at femininity.