The issue of subscription apps came up a lot in recent months on ATP [0] regarding Casey's new app Callsheet [1]. They've been arguing heavily FOR the use of subscriptions, and I came around to agreeing with them. The part that especially convinced me is that subscription revenue creates an incentive for the developer(s) to keep working on the app, in particular after the big wave of launch sales is gone. (You could argue that a lot of apps don't necessarily need new features, but I feel like especially on macOS and iOS, you want the app developers to check if their app still works properly on the new major releases, and issue fixes if something breaks.)
The very important thing is the cost of the subscription though. It needs to be reasonable. I'm fine with paying a subscription even for a small app as long as it's a low yearly price (like 5-10$). I feel like that's the bigger issue with subscription apps nowadays - the prices are often unreasonable considering the type of app, and they end up charging 3-6$ A MONTH for apps that should be at most 1-2$ a month.
[0]: https://atp.fm [1]: https://www.caseyliss.com/2023/8/7/callsheet