I think being able to visualise a scene and write it out for me is what I need to consider with every word I write. It's not really a case of ensuring verisimilitude in every scene that I write but more out of ....necessity?  You know how they say an image tells a thousand words and so forth? I rely on just general auditory and visualistic stimuli in order to concentrate on writing. When I want to write abstract details, I usually rely more on music to help me concentrate my tone whilst if I am writing concrete imagery, I usually have to both listen to music and visualise the scene in my head. 

In terms of text-by-text roleplaying, it's an interesting case because you're essentially collaborating to write a story instead of the other way around where you are the sole writer of the story. You're gonna have a lot of writing styles mesh together and I can definitely say that as aphantasia varies relative to the individual writer, the level and style of prose in a thread is gonna weave and bob between multiple styles of writing.