I don't quite understand the criticism to be honest. How is this any different than adding a new girl? All other content doesn't suddenly cease just because there's a new girl, so why would adding a new protagonist be any different?
I think this is jumping to assumptions more than genuine criticism? I don't mind criticism, but if the criticism is just an assumption, I can't exactly take it to heart. The rationale for adding female Protagonist, is simply because I thought it would be a cool idea if you could play as a female Protagonist with the option of playing as any of the current girls.
With the character pack (which will be added in soon), you can play her as Rachael, Sam, Sakura, or Emilia. So it sounded like a cool idea lol
After next release, we get a story continuation for the Teacher. So it's not like progress is halted? I'm sorry if you're not someone who likes Female Protags, but there are also people who don't like the Whore routes, and there are people who don't like the Harem Routes, that's just what this game is, it's a game that has something for all kinds of players, and it's not going to be a game that can always please everyone, no matter how much I try to make room for every players preference. I hope that's a fair enough.