There are 9-10 billion people on this planet.
Among those people, you have countless personal preference based on everything from what they expect to what makes them comfortable based on past experience.
There are also 10% or so with ADHD and other things, changing it up even more.
So run all of that through a computer showing you a majority of the likely outcomes, and there you go. There’s no way that your style, your choice of content, your presentation, how you present the material, etc, will please everyone because it’s impossible to do.