Let's say I want to make a large transfer to an exchange. I am sure to verify the receiver address. However, if the exchange made a mistake somehow, all the bitcoin would be lost forever. So does it make sense to send a small amount first, confirm that they receive it, and then send the rest?
Can but I'm not sure how often anyone could make a mistake for this. You are right, if you had copied a wrong one then that's your fault or any missing figure or letter, and position intetchanged.
I've read some cases if the deposit didn't process but you correctly do the method then no worry they will refund or fix that ofcourse.
Regarding deposit address, the address haven't change in my case. Not sure though but everyone has constant same deposit address that is fixed when we register I think.