I must admit that I have only very briefly looked at the new sightreading syllabus, so wont comment on the grade 2-3 jump
I am pleased they have simplified it though. Dumbing down? I hope not too much.
I would say my lot are pretty average sight readers. They enjoy the sight reading they do throughout the year....variety of books from my library, but they all really hated the ones we do to prepare for the exams.
It wasn't just because the pieces were hard...they could get through them, but they all seemed dissatisfied with their performances of them. The more dedicated were bothered that they couldn't pick up the style, that they hardly noticed the dynamics, that the phrasing wasn't too good. Yet, their exam marks were never bad in this section.
So I am rather hoping that making it easier will mean we can try to aim for a really good performance, and I also hope the marking will reflect this. Not just passing them for getting through it in a blind panic, but really performing the pieces.
Easier pieces.....tougher marking....so hopefully no dumbing down there.

As for simplified pieces such as the Autumn piece. I suppose that sort of thing used to get to me once upon a time. Reckon I'm getting less stressed about such things as I get older.

Does it matter that much? I guess that Vivaldi never wrote the piece for piano anyway, so you could hardly get a pianist to play the unsimplified version
So assuming they are playing umpteen pieces throughout the year, does it really matter if one piece out of a choice of 18 for an exam (in the early stages...whilst they are still relative beginners) happens to be a simplified version of an orchestral piece?