Incredible insight.
The issue is not knowing how to trigger those scenes as the process is needlessly complex. I've unlocked everything so far but if future scenes will require revisiting certain parts of the game that you don't have a save off, and therefore have to start a new game and skip the texts all over again, then a solution should be implemented to prevent wasting time.
Making excuses for something arduous is not a good long term solution.
The "insight" is that you should play the game as you think you should play it.
In this game, as in many other games, there are different paths, which give different experiences based on what you like.
For example, the path you choose for Rebecca. If you have the walkthrough on (see Preferences) then it's clear which answer leads to a romance path and which answer leads to a dom/sub path. If you like romance, you should pick that one (even if it doesn't have content at the moment), because you might not really enjoy the dom/sub scenes. If you don't like loli's then choose the path where there aren't any. Etc.
For most character in this game, the main variables are "love" and "corruption" (which you will see in the walkthrough). If you want love, then pick love. If you want corruption, then pick corruption.
The dev probably has good reasons why you see this or that scene on this or that path, and that's why you can't see everything in one playthrough.
If you fear that you missed something, you can use a gallery unlocker and see those scenes which you missed.
Then, in the rare case that you didn't get the scene you wanted in your canon playthrough, then you can either try to get it yourself or ask for help here.
In my opinion, this game (although the plot itself is not very simple, see the family tree in the first post) is fairly straightforward.