Hoo boy. the whole issue about protagonists and immersion is something I've been thinking about for a long time now. The best way to go about it, etc. And I find myself agreeing a lot with this. Personally, I'm of the opinion that a silent protagonist shines brightest when in a less complex plot, while a protagonist that does talk - and has a relatively pleasant personality - fits in pretty well in more complex stories. And of course, there are always exceptions. I also think immersion also depends on the world as much as the characters. Getting lost or immersed in a world is pretty easy imo if the worldbuilding and lore is well made.