That's where my confusion comes in here though...
Calendar sets were in Fantastical when I purchased it in Version 2. Why should I have to rent that feature into perpetuity?
The "value" the developer argues the user gets from the subscription model is frequent updates with meaning without needing to "wait for a major release". I looked over the Fantastical release notes there isn't much there for all of 2021.
Changes made in past versions of Fantastical for Mac.
flexibits.com
Doesn't surprise me though as what can you add to a calendar app every quarter or year? Even Microsoft had to bolt it onto Outlook to build a value case for paying for upgrading the calendar app in Office.
The other argument from developers is to cover the ongoing costs of supporting the servers needed to store the data to make the feature work. That would make sense for Fantastical if they needed servers for this... But I'm sure 99% of their customers are using calendar systems where their data is stored somewhere else! For me, that's my own Exchange server for others it is a Web DAV setup or Google Calendar or whatever else...
Things 3 is a great counter example. They have a proprietary sync infrastructure and they sell their apps without a subscription...
I could entertain the sub if the price was reasonable, offered a lifetime unlock, and they had a compelling story for it. It has to be more than just "rent the features into perpetuity so I have passive income"...