The farmable garden would be an option, you don't have to do it. But if you need extra money, you can have it. If you want lust events on demand, you can have it, and if you want to gain a trait faster, you could. Currently MC doesn't have enough things to do, because you should never have to click the Skip Time button.
Sex isn't important to the story of Harem Hotel at all, that's actually why it can so easily be made optional. All it would take is you saying "no" every time and the story would still continue as it is.
Could you imagine going to the movies without music? Music sets the tone, it's a very important tool on a writer's tool belt. Nearly as important as the dialogue I would say. Voice acted or not.
I'm not a perfectionist, it's not that deep. Just take a look at or play any old content I've made, and you will see the difference clear as day. Harem Hotel is my first attempt ever at doing any of this, literally everything. So it's only natural that I will learn so much in my first 4 years. Bringing the old content to the current content's quality is also good because the first impression matters most, so it shouldn't be the worst part of your project. (some of these animations were literally in 3 frames per seconds, I have to remake these things)
1 new main character has been a plan for years, but I won't add anything that isn't very important and could not be done in any other way. Some of her content is already developed. You will like it, trust me.