Going to preface by saying that YMMV and that i definitely dont represent all readers. But personally I dont mind wall of texts or ridiculous plots.
For the first, I would give my fondness for actual books as an example. So for me the word:choice ratio isn’t really a big deal. Good and stylish writing is going to go a long way in that department though, so try to avoid long exposition and character backstories until after the reader is hooked.
As for ridiculous plots, i would say that its not super important to me. All stars pro wrestling game is a great example. Literally no plot but still immersive because of the writing style and the good characterizations.
For me what breaks immersion the most is when a cyoa tells me what my character is thinking. Sometimes its necessary, but i would advise you to try to avoid it as much as possible. On a related note, if the stats are “personality” traits, having the choices and transitions that are worded in ways that don’t mesh with particular traits breaks immersion for me. Usually i’ll start the game by opening up the stat screen and looking at the various stats. If you are using the opposing stats, i’ll decide during character creation the personality i’m interested in roleplaying. If you have a shy vs confident stat, but you have a group of choices that are only written from one perspective, if I’m trying to roleplay the other stat, it breaks my immersion.
Another thing that breaks my immersion, is forcing relationships on the player. CYOAs are a bit different than regular books. Its a lot easier to manipulate a reader into liking characters in regular books because you have more control over the main character. In a CYOA, if its important that the MC has a particular relationship with another character, introduce them ASAP to the reader and have them have an established relationship. If the character is being introduced to the MC for the first time during the story, expect that different players are going to roleplay the relationship differently. I won’t call out particular CYOAs, but I have had my immersion broken at times for this reason and it has hurt my overall enjoyment of the story.