Another data point (a little long-winded, but wanted to be specific).

Flew EVN-DOH-IAH on Sun/Mon.

At check-in in EVN, was asked if I had any large electronics (I lied and said no). EVN security didn't care of course.

Gate opened T-2 hours in DOH and there was a table to check electronics. Gave my Surface and Kindle over to be wrapped and asked about my Canon EOS M and 3 lenses. The EOS M body is shockingly small (easily fits within the size constraints, but maybe 2-3X the allowed thickness), but she said it would need to be wrapped. They didn't know what to do with the lenses (Rokinon 12mm, Canon 22mm pancake, Canon 18-55 kit). I said I would ask at security.

I asked desk about my RAVPower 20100 mah external battery and they said it was fine (it's maybe 2-4 times larger than specifications).

X-ray tech saw the lenses packed in my backpack and told the screeners to pull my camera. I explained that the camera was in the sealed box and it was just the lenses. He said that they were fine then. He never mentioned my quite large USB battery.

Handed over my sealed box at the desk and filled out the form they give you. I received a notification from the QR app with the new luggage tag number and that it was loaded onto the plane.

Upon arrival in Houston, all sealed boxes in wrappers came off of the belt first. A Swissport employee took them all off into a scansioned off area and then walked them over to a table for pickup. He said a QR employee would be the one checking receipts and giving out boxes. 15 minutes later no QR employees so he told us to sort through them ourselves and he would check luggage tags. I have GE, was through immigration immediately, and boxes were maybe 2-3 minutes after me getting to the carousel. Swissport guy left the table with laptops several times and someone could have easily taken some.

Emirates was at the next carousel and had 7(!) employees helping with the checked electronics area for their belt. They also had separate lines for pickup for 1st/biz and economy passengers.

There were maybe 20-30 checked electronics boxes for my mostly full flight on a 77L. There were however 51 wheelchairs waiting at gate (I asked one of the handlers!).