You are adding more rules

I'm stating the existing rules.

If all that matters is higher orders first

I don't even know what you mean by that. We have the acronyms as a reminder of the rules, as I already said.

I know operators apply to the numbers to their right.

If you know that then how did you get 2-2+2=-2?

With 2/22, you don’t know if it is 22/2, or 2/(2*2)

Yes you do - left associativity. i.e. there's no brackets.

When you are dividing by numbers, you put them all in the denominator

Only the first term following a division goes in the denominator - left associativity.

BY CONVENTION, as I said. You don’t have to repeat what I said a second time.

I didn't. You said it was a convention, and I corrected you that it's a rule.

It’s not like you could have tried in your head different orders to combine 3 numbers.

addition first

2-2+2=4-2=2

subtraction first

2-2+2=-2+2+2=-2+4=2

left to right

2-2+2=0+2=2

3 different orders, all the same answer