In an ideal word, without gender and moral/legal restrictions about one changing it's body, one could freely experiment with their body, cherry-pick what they like, alter its shape or characteristics or behaviour temporarily or permenently.
Maybe you want to experience testosterone for a couple years, or have bigger or smaller or no breasts, or a dick or a vulva or nothing of that, see how you look with facial hair, stay on estrogens because you like your smell more or don't like having spontaneous erections, or maybe a different hormones mix makes your period less invasive and painful and you need that.
None of this is silly or luxury.
If we have entire industries, markets and people dedicated to colouring and arranging our hair or hiding our wrinkles or crafting visually pleasing clothes or digging metals and stones from the earth to shape them and hang them on our ears or animating pictures on screens to tell stories or having special places to cook, serve and consume unusual food or producing drinks that make you feel dizzy or or building weird planks and buildings and infrastructure for people to slide down snowy mountains...
And we also have helicopters, ambulances and healthcare professionals to fetch and care for the ones who slide down snowy mountains and broke their legs, drank too much, got an infection after piercing their ear or sick eating a bad meal in a restaurant...
And everybody is okay with that.
Then it's neither silly nor a luxury to have facilities and people and procedures and chemicals dedicated to people who want to feel better or differently in their body. Or change it.
And we can do that without ever having to use the word masculine or feminine ever again.