I can confirm that my Mom and sister both used the onpoint testing with the free tests they received in the mail and were able to board just this morning no problem.
We do this every time we cruise but we do check our bags the night before so we are not having to lug them around in the morning. We drive to port so are in no rush to get off, and then we don't have to deal with the longer lines of people trying to get off earlier. Our experience has been that between 9:30 and 10:00am is the last call to get off.
We prefer balconies, but would never pay $1000 more for one. We don't use it enough to justify that much extra. Unless its around $200 or less of an upcharge, we go with interior rooms. We enjoy how dark it is in the interior rooms also.