No, just because you have a gripe or are having a difficult time with something that has changed slightly, doesn't mean that I am missing the point. I'm not missing the point at all. I was just trying to help the OP.
You don't seem to understand that this is a user to user forum. You are not talking to Apple and Apple is not here. I'm another iPhone user just like yourself.
You refer to beta testers, well the public participates in beta testing. If this was some huge miss on Apple's part, with everyone scanning barcodes because of covid, they would have gotten tons of feedback during beta testing. You could have done beta testing yourself if you wanted to and provided feedback about the new iOS. In fact you can still provide feedback using the link provided by the community specialist. Have you done that?
I can pick up my sleeping phone from my desk, it automatically wakes up because of 'raise to wake', I swipe down for Control Center, tap the QR code icon.. and I'm literally scanning a barcode in maybe 3-4 seconds. One hand behind my back. I doesn't get much quicker than that. If I were walking up to somewhere that I knew I needed the scanner, it would be open already and would take me a solid second.
And as I commented, the added bonus you get from the QR scanner from Control Center is that it automatically launches whatever the barcode is directing you to. So you don't have to tap a pop up on the screen at all. Have you tried it??
I just did the same test as above by selecting the camera app instead. One hand behind my back. Pick up my sleeping phone, it wakes up, I tap the Lock Screen camera icon, camera is open instantly, hover over a small barcode and it reads it very quickly. This might even be quicker than the QR code scanner with the recent changes! It produces a small popup that I can tap on. I don't even have to hold my phone all that steady, pop up stays there and follows the QR code around. I shook the phone around a bit and it kept focused on the barcode for 10 seconds before I pulled away.
Now to get back to what the OP was saying. They commented on having to hold their phone super steady, as did you. I don't have to, in fact I simulated shaking around a bit. Maybe they/you are not steady handed? or maybe the phone is being held at an improper height (there is a point when you are too close to the camera for it to focus), or maybe the camera was having trouble focusing?
I did encounter in my testing where the focus would take a few seconds, but you can typically help it along pretty quickly by tapping right where the barcode is that you want to read. When I do that, it instantly focuses and instantly brings up the popup.
The OP commented on how small the pop up was. Well that might just be a learning curve. You can actually tap anywhere on the barcode itself or the pop up. unless the barcode is quite tiny, there should be lots of room to make the selection.
I see that you also commented about the pop up not sticking around long enough to tap it. Alright, well did you notice that when the camera app identifies a QR barcode a yellow circle pops up in the lower right part of the camera, easily within reach.. Well that yellow circle is remembering the last code you scanned. It stays there for 5+ seconds. you tap that, menu opens, select open in safari, copy, save it to your reading list or share it.. this is great.
But again, this is why I suggested the QR code reader from Control Center. Even if your phone is asleep, tap the screen or raise it, swipe, tap and its open searching for a QR code. you don't have to tap on the barcode or anything.
I see that the OP is using a 12 Pro Max. I'm using a 12 Pro, so it's also possible that the OP is having a harder time operating their large phone with one hand. But that's a trade off with a larger phone I guess. Things like pop sockets or similar devices can probably help with one handed operation.
My testing should be worst case scenario as far as timing (phone out of my hand and asleep). If you're in a line somewhere and you know you're going to need to scan something, then you should already have the camera app or the QR code scanner open.
I understand others will have varying experiences and expectations. But I am not missing the point. I am only trying to help.