Slaves were usually private properties. Taking them to wars would piss off the nobles. If the slaves accompany the nobles, they only did slave duties and took care of the nobles. There were some that were ordered to the battlefield by the noble owners, but this was usually considered as...
To add in the arguments, doesn't trans include all people who wish to become a gender that he/she is not. I mean in this case it is a little bit more complex is that his desire to become a girl comes from his sexual identity more than gender, so is it accurate to categorize him as a transgender...
Official manga reading sites have to deal with copyrights and regional laws, including, but not exclusively, content rating and censorship. While it is indeed a bummer for it to be region locked, it is understandable why it is.
That's not axing, that's more like bankruptcy. Usually when a manga is axed, it's becuz it doesn't do well on the magazine's popularity poll. Now with official online manga app, there might be other data that they can use. We can help with the latter (if they have an official reading site), but...