What is the crowd's opinion of Google Smart Lock?

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Yep Google Smartlock https://get.google.com/smartlock/

Smarlock for Passwords is under your Google settings, in 6.0>settings>Google, at the bottom "smartlock for passwords"

It also works in Google Chrome for Windows, Mac, Android

Hey! Netflix credentials are saved to Google Smart Lock on Android (if you use Google Services). You can view the passwords saved by Google here. Maybe that has something to do with it.

1. Two SIMs? You can only have one phone number. Is that second SIM a data-only SIM? The 5a should arrive with one SIM, but I wouldn't even use that. I'd go eSIM, just by booting up and logging into your Google account. It will get provisioned automatically.
2. Again, you can only have one active cellular SIM active at any time, unless the SIM is data only or from another carrier.
3. Docs and photos should be backed up to Google Photos and Drive to assure preservation.
4. Don't think it affects past photos, but am not certain, myself.
5. Smart Lock does not use the SIM for determining when to be unlocked. https://get.google.com/smartlock/index.html

Yes, it's a feature that auto-unlocks the phone when connected to specific devices, or in specific locations, or I think even when connected to specific wifi networks. https://get.google.com/smartlock/index.html

Smart Lock already shows notifications if you connect to a new BT device asking if you'd like to add it as a trusted device. It's not hard to explore the other options from there. Just imagine how well a "You're at this location a lot, want to add it to Trusted Places?" notification would go over.

And fwiw, they have a Smart Lock landing page so odds are they're taking users there from an ad or something. There's also a wealth of knowledge in their Support center but I guess people expect to be spoon-fed every feature of their device. No one rtfm anymore :/

That's great and all, but that's one of the problems with Google, a ton of conflicting and overlapping features and services, none of which is a master of all.

You're talking about THIS, but Google also touts THIS. Two completely separate solutions to the same problem, logging in your accounts.

The second one is ideal here because you're bringing along a bunch of existing services with all your passwords already set up from another platform and Google claims they will sync across all your Google devices. I was asked by Netflix if I wanted to save mine a couple of times and I've always said yes. You simply have to have Smart Lock enabled on your devices. I do. But when I check at https://passwords.google.com to see which passwords I have saved, apart from Chrome data sync passphrase, there's nothing else there. Some others claim it works for them, but many others it doesn't.

Both above solutions require developer effort while Apple's solution is built in. Just the way they backup user data from all apps is sufficient to restore your apps and still be logged in on a new device in most cases.