I've had the understanding that subscription isn't an option for most types of apps. Auto-renewing subscriptions are only allowed for content or services. And non-renewing subscriptions are pretty narrow in scope as well. What type of subscriptions are you selling and for what type of features?
I'm using the non-renewing subscription, which I don't think is really as narrow as some of that guidance seems to suggest. I've seen them used in lots of different apps, in addition to the auto-renewing subscriptions I mention above.
Perhaps if Apple just actually changed those guidelines and made it explicit that this is ok more it would be a path to sustainability for more apps.
I feel like if more apps adopted this users might also become more comfortable with it.
Here is Apple's guidance document: https://developer.apple.com/in-app-purchase/In-App-Purchase-...