I wouldn't say audibly indistinguishable, at least not in all cases. I mean, seriously, anyone who can't tell the difference between a Newf and someone from Texas just by hearing them speak is probably deaf.
I know that's an extreme case, but still; it's not like we all sound exactly the same.
Well, yeah, but Torontonians probably sound like people in other Great Lakes cities
No one in Ontario wants to be referred as Torontonians. No one, especially in Hamilton. Even people from Toronto want to be called Torontonians.
How many Torontonians does it take to screw in a light bulb?