People are going to complain about the grind always... No matter what you do. Hopefully the difficulty system does not add too much work for you programming wise.
My two cents... Once you understand the mechanics, the game is pretty simple. Focus on one/two girls and their associated stats/preferences, and in 3 or 4 loops, you have achieved most if not all the scenes. Then the "grind" is rinse a repeat to get the achievements. Some of them can be tedious (the 100 fucks, 90 Strength/Stamina and the 1000$ in fastfood take forever...) but hey, the game is easy enough without those bonusses.
Also, with a character fully developed (finished a loop with 100 on the stat, and max percentage on restart), the new girls/achievements introduced on new versions are done in a breeze, so I understand people saying is too easy. After a certain point Experience can only be used to buy extra days, so you have all the time in the world to grind.