I am using 1Password 7 on iOS without a subscription (having originally bought 1Password 4), but if I buy/download the app today, there are only two in-app purchase options: 1) subscription and 2) pro features. Is the in-app purchase 'Pro features' what de facto buys the standalone version of the iOS app?
Yes. If you bought 1Password 4 for iOS, then 1Password automatically unlocks the Pro IAP when you tap Restore Purchases. If you sign in with a 1Password.com account, it does the same.
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Go look at their site and their online dialogue the last 12 months. They want to be subscription usage only as soon as possible. They'd already be on that now if it weren't for the enormous amount of pushback they got (IMO).
Small, independent developers have been heavily disrupted by the App Store business model. So many customers expect free updates for years, no matter how much the software cost in the first place. On top of that, they expect to be able to pay once for a piece of software and use it on as many devices as they own. As a result, developers need to either move to a subscription model or release paid upgrades yearly/semi-annually to keep their devs paid and moving forward.
I've never felt pressured to sign up for a 1Password.com account (I did, because I wanted to be able to easily separate out different vaults for my children to use for the passwords they need). I suppose I might be the exception, though. I bought 1Password 4 for Mac twice.