I need to say a few things, based on the comments I've been reading:
First off, any time new technology is released - whether it's new across the board, or new for a particular brand, there's a learning curve and some tweaking that needs to happen. Period. Those of us who love the newest, shiniest, cutting-edge devices, and want them as soon as they come out the oven KNOW that the best version of a device is at least a software update away. I know this. I've known it for a long time. So I accept the glitches, in exchange for having the newest phone before most people have it.
Let me keep it 100% - the fingerprint and iris scanners on the s9 were PERFECT. Folks melted down about the scanner being on the back of the phone - I think I hit the camera twice in the beginning, and that was it. The iris scanner was quick and accurate. BUT folks get bored and have to have the next greatest thing - which often comes with a higher likelihood of failure. It's like when power windows on cars came out. Power windows are great...until they get stuck and there's no way to crank the window up - and the rain and snow blows in your car (yes, I'm old). So if you want perfection, or close to it, you wait until the kinks get worked out.