Lol don't be sorry for "if you've wasted time"
If people are on the forums...they are in no rush :D

Either way...it's not a bad idea. Had thought about why they don't do this...
and it's possible that they can't entirely make this change.

Not 100% sure but I believe that ninjas such as Swimsuit Ino and Playboy Sasuke are helpful to the guys or girls including the main character. IF they allowed for you to be a girl(earth, wind, water, lightning, or fire) then you would always benefit from Playboy Sasuke. There will be that 1 person that'll say "Girl Earth main works with this team best!" and then everyone starts playing Girl Earth Mains...and the Guy Earth mains go out the window 100% lol

Just as example. This would just lead to everyone still making specific changes. Suddenly you have no Guy Fire mains...meta switched to all girl fire mains....so everyone is playing that. Perhaps now Guy Wind Mains are taking over so everyone switches to Guy Wind Mains....and so on.

This would make it fun for the few that actually never stop playing their favored main(s) and just want it to be a girl/guy....but it would just possibly make others stronger because they can now switch guy/girl when it benefits 1 or the other more.

Lots of people are always looking for the next new OP team...
There would be disadvantages because of the above...you'd end up with teams that benefits a specific guy/girl ninja main and then if you don't switch to that...you've now ended up weaker.

UNLESS I am wrong and ninjas like Swimsuit Ino and Playboy Sasuke are not affected by guy/girl main characters...then all I see are possible advantages and disadvantages.