I was merely making observations. Not all feedback is going to match the creator's intentions, but it's up to them to decide which feedback to consider and which to ignore. Yes, it may be the case that picking one person's story to the exclusion of others is not the intended route. However, cutting off potential routes is built into the game. If cutting off routes wasn't intended, you wouldn't be able to. Besides, playing in a way which is possible-but-not-intended is a good idea, it helps check for bugs and such.
I fully agree on choice. However, the nature of this game is not monogamous, and the various characters hint strongly at the planned combinations, even if MC is off-screen.
It is even set up so that not pursuing them, in most cases, makes their virtual existence worse, so intentionally cutting off routes in this game is abandoning them.
Short answer: the dev made it so people could play monogamy, but doing so is like buying Turbotax Premium and filing a sing 1040EZ.