That's fair and kudos to you for realizing that this Dev isn't one for you. His world building and incorporation of multiple characters I feel as though makes the storyline's fresh and allows for repeat plays because each time you can focus on a different character. His character development as you have described is something he's known for in his other games. While I agree with you that Sam is my favorite character in this game, I felt similarly about Alyssa in his previous game and then came to enjoy others (like Bonnie). So Sam is clearly the main protag but others will have sub stories along the way. In this most recent update I believe we've been introduced to another primary character that will have her own sub plot "Natalie". She shares all the same characteristics that the Dev puts into his characters and I can see her being another one with intense corruption (likely at the hands of Zach and others).I played this game first when it was 0.5. It was quite lengthy and the pacing was great. I was quite impressed. But then I played 0.6 and 0.7 and I was disappointed, it lost its charm. I'm also only interested in Sam, so to me the rest is like filler, although the other protagonist, I cannot remember the name, is also interesting, but I didn't like her content in 0.7 and it's not as fleshed out as Sam. I think it's better to wait and skip a few updates, probably more than one, since the development is going at a good pace anyway. I think I'll give it a try when it will reach 1.0.
Thinking about it, I don't think there's any game that has enough content in a single update not to disappoint. It's always better to skip a few updates.
Anyway, this looks like one of the very few developers that has real talent, he is also a hard worker and has a kinki imagination to create very hot scenes and expressions. But he also strays by introducing lots of new characters and abandoning others, so he still has room to improve. Probably the demands he gets from some of his supporters make the story and characters to develop at an inconsistent pace and go in some not that inspired directions.
I will also warn many others that it appears as though this update is hinting at a strong NTR storyline development. While I enjoy that storyline I know many others do not so be forewarned.