Why is it not possible to provide a free trial for paid apps?

My application uses "paid" monetization model. I think in the productivity category it works quite well. However, when I advertise my application, 50% of the questions are: "is there a free trial?" and I would love to provide a free trial to potential customers, but the App Store doesn't allow me to do that. I don't understand why this feature is not available.

I even started considering migration to in-app purchases, but it's quite a big deal. I managed to establish quite a good profit and I'm worried how it would affect my positioning and results. On top of that, I really like the paid up-front model, because it solves many issues and doesn't need any extra implementation on my side.

I'm starting this thread to hear what you think about that and how many people are looking for this feature. I also created a feature request in Feedback Assistant: #FB13810170

Because it's either, free, freemium, or paid without crippleware.

Why is it not possible to provide a free trial for paid apps?
 
 
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