UNNECESARY? Each VN / KN must be true to itself and its creator. to be good you need Fair Renders and Plausible story line that fits the theme. to be great in my view renders where the model and background are one not green screen style. and much more.
Ratings is up to you how you feel, during and after playing the game. do you still try to figure out the game once you stop playing? can you visualize the game in your mind as if you can see it in happening before you (if not its only good not great) and for me I need great renders and Steven King style descriptions' as I play so both writing and renders. to be immersed into the game.
You are right a static image can create a scene, just as well in fact many static images can equal Animation if I click fast enough! but I rather see it timed correctly and visually tell me the story meant to be seen
In the VN you reference "Sorcerer" the animation's are of two types, short scene actions like walking through the hall or fight scene. no text there either and second type sex scenes which are not required to make the story they are there purely for entertainment value. The author has two VNs and they are doing well and his second has lots of animations and it out every few weeks at most so animations don't always slow down the developer. and its chapter 2 of the original VN for this developer. so worst sex scenes of F95 not really true but you want a great sex scene
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not much text there either.