transfem and transmac were terms created to be more inclusive to different agabs (assigned gender) or intersex identities as well as to different gender identities, a nonbinary or gendernonconforming /queer individual can still identify as transmasc individual for example but may not actually identify as much with male. it is also easier to say then the binary trans male or trans female
Aren't the terms "transmasc" and "transfem" supporting the idea of a biological gender binary, rather than gender being a spectrum and the binary just being a social construct?