If you didn't enjoy it, then stop playing the game, mate.
Don't rant to people that don't care just because you found the system of choices relating to various relationships unacceptable.
If you haven't already noticed, the choices of a dating sim like this one are based on decisions IRL, whereby the most 'innocuous' choice, as you've put it, can lead to the most drastic changes.
If you find that you've missed out on a path with one of the characters, guess what? THERE'S A SAVE MENU! Go back and make the alternative decision in order to achieve the outcome you wanted. There's even a SKIP button there so that you can fast forward through the conversations you've already read through.
Innovative, isn't it??
The Author took their time to carefully craft this game and plot. In essence, the time you're meant to spend playing it includes the screw-ups you'll definitely encounter along the way. Hence, the reason why you can go back and replay saves.
Don't bitch about something utterly petty that can be easily rectified by YOU, THE PLAYER. Have you ever considered the possibility that you're just garbage at playing AVN's? Might wanna invest your time in getting better at them before you start barking.