Perhaps the latter.

Certain types of screw convolving are essential to a number of my parts.

That feature is mostly now missing from the free version, though my existing files with it can change the parameters (though not add additional).

The 10 editable thing is just weird. It’s like having n light switches in your house and only 10 can be on at any given time (mechanically interlocked), but in exchange you get free electricity. While that’s a worthwhile deal for most, it’s hard to see how that incentivizes anything. It’s just mildly annoying.