Absolutely correct! Even if you could see if a ballot in you name was received, there is NO way to verify that it was the ballot YOU sent.
The only sure way you can be certain YOUR vote is received is in-person voting. (But even that doesn’t guarantee it isn’t manipulated on the back-end.)
With the new optical machines, if you scan your vote, you will count OK. Mail vote can be manipulated many ways and no vote can still vote! The system has very little safeguard against crooked counters. The main build in safeguard is the integrity of the counters and that both parties have representatives on every station (should have!). Please, volunteer for poll work!
But then with ballot harvesting even these safeguards can go to hell.