Longely That said i dont have any problems with having it off by default, if its undesired for the majority. only problem with that is discoverability, but maybe thats ok
I think that's where good communication comes in. But I think that applies the opposite way too. If that is the decided default behavior, I would want a very clear communication as to what's going on so I can make an informed decision. Maybe even make it a first time opening prompt... "How do you want to use this?"