Another thing to always do is always make a test deposit first. Then your larger deposit afterwards. You should probably make a test withdraw from the exchange. This can be bothersome though if they withdraw fee is high. If you dealing in a large amount of crypto then you definitely should do a test withdraw. Always check your address and the address you sending to. This is also another reason you should make a test deposit/withdraw. So you deposited.withdrew to the same address again twice in a row and the chance of making the same mistake twice is little.
Yes, it is, but it is not financial benefit to do if you don't have plan to move significant fund. If moving minor fund, there is only one option, making deposits at once, but do remember checking deposit address carefully before click on Send.
It is important to do trial deposits if someone have plan to move significant funds, as well as withdrawals too. I agree.