The amount of people who do not want to pay upfront, but would buy after a trial, is not just substantial, but game changing.
You can also add the same pressure to test the app after installing by offering a 14 or even a 7 day trial.
Perhaps on Macs it's different, or maybe it's due to your price point, but still your approach automatically drives away a large swath of potential, but cautious buyers, or those who don't want to be bothered by the refund process. Your pitch is "here is some good stuff, and here are the hurdles if you want to test it".
I'm not affiliated with them, but I am a customer. They put a lot of effort into finding the right balance of what to unlock upfront in the trial. And their license/unlock process is pretty seamless.
I don't dispute the power of a free trial, but it can be a fair bit of work to get the details right.