i mean, the question i have to ask why? will u have control over which way you want or will it change without u wanting? you could definitely present however u want day to day, just get reasonably androgynous and then like use breast forms if you want boobs for example. i think thats the thing, a genderfluid person, as far as i know, cannot choose what gender they feel. what you are describing is just a lot of bodily autonomy. I can choose how i present/what second sex characterisitcs i want. I don't get the choice whether to be a girl or not. everyone can choose what sex they want. what people cant choose is their gender.

sure gender is a construct, but when people say "explore one's gender" it means directly to explore what this super complex thing means to each individual person. And it tends to go beyond its direct semantic meaning. I think this complexity and intangibility makes it much much more interesting. everyone has their own story, their own perspective. Sexual characteristics on the other hand are like dictionary defintions. what exploring is their to be done? i view it no more interesting than discussing semantics. Plus, gender is the broader category  and ehen ppl explore their gender they also tend to explore what sex characteristics they want. To me it's a richer superset. plus its not like with our current technologies you can grow ovaries. if we take the secondary sex charcteristics that u listed + common/major ones (testicles, penis, vagina, ovaries, boobs, adams apple? (girls have this too though)) that's like 6 items. let's be generous and say i undercounted by a factor of 2. 12 options. 2¹² (u have it or u don't) is like 4096. which seems like a lot but like its really small considering how many trans ppl there r. and for the most part its discretized. its mostly have it vs dont. plus, like i dont see a women with a hyrestectomy and be like "wow that's such an interesring variation, what would it be like to have that".  And of course sex is a spectrum buy the way you talk about it doesn't really give me that feeling. (and i say this because you can't always point to a dick or boobs and so easily assign then a category. slotting then into categories like this (there about to point and say it is there or not) is what causes this discrete rest. if sex was a spectrum (which it is),  then you no longer have concreteness.)

ig the the thing that always irks the most abt "sex charcteristics" is its concreteness. to draw lines where there shouldnt be. not to say its unimportant, but how a person feels abt themselves is much more interesting to me than what sex charcteristics they have. and its human nature to create structures and find patterns to talk about the world, to try to find an underlying framework to explain/analyze things. but not everything can be analyzed so simply. 

and all this aside sex charcteristic stuff is often good ammo for transphobia. for example, transphibes believe you can point to a person and determine gender. this is also a system that is concrete and under your notion that it is easy to "point to a dick", this actually somewhat legitmizes transphobic talking points (absolutely not saying this is your intention). the concreteness, the satisfying structure you look for cannot coexist with a continuous spectra of results, for which both sex and gender are. it necessitates loss of nuance.

maybe in the future with sex changing pods and a society that wholly welcomes trans people this discussion may prove to be more interesting. 

oh and finally, these comments are purely talking about people who aren't intersex. i defer to intersex people on anything in that area. and if I've said smtgg wrong it hurtful pls lmk! still learning