Sure, at first sight reading duets will be difficult. You may be only able to catch few notes here and there: maybe a few bass notes, the melody by itself, a few familiar chords or scales. It may sound horrible, but you will be gaining skills by doing this.
I would probably play better after a lobotomy...
And then of course there's the issue of the size of one's working memory. Scientists still cannot agree if this is something that can be increased by practice. I doubt it can, one can only use what one has more efficiently after practicing.
Which any ensemble (though probably not your teacher) will give you, happily, if you stop during a performance with them.
It probably can't be, but it remembers a certain number of "things" (called chunks in the terminology), and what constitutes a "thing" can most definitely be modified so as to expand the workings of it. Consider reading, where we start out with individual letters, move on to groups of letters, then whole words and (in some cases) phrases, sentences or whole paragraphs. With sight reading, you start with notes, but then move on to chords, figures and phrases. You don't store any more bits, but each bit contains a whole lot more information.
I agree and I do think everyone can get better by practicing this "chunking". Just don't think it's enough to be really fluent. And I think it comes with time and playing more repertoire, not by being forced to play under pressure.Consider someone who is dyslexic, they can be better readers, but they will still have their issues and could not do consistently as well as someone who is not. So it always puzzles me why some people seem to think that by practicing enough and correctly will make everyone a great sight reader. Or a virtuoso player
Pressure has been used to "cure" all kinds of learning disabilities for ages in the schooling system and it never worked well...Besides I do not really react much to outside pressure, I have no problem to just stop and walk away. Only inside pressure would work and if I have no desire to play with someone, where would that pressure come? It might have worked when I was a child, but not anymore.
Seems like an ensemble would hate you too if you weren't getting any notes right.
1) stopping without (very) good cause
What would be a good enough cause? Earthquake?