GP Premium itself adds a ton of functionality to the free GeneratePress theme. You can check out the videos on this page to get a taste of what each module brings: https://generatepress.com/premium
When it comes to features specifically, we’re not trying to be the theme with the most features. Many themes have done that before, and the result is an overly bloated/slow theme that breaks after each update because the code is too heavy and complex.
The reason we’re still the fastest theme after 5 years (almost 6) is because we’ve been very careful about adding the right features – not every feature we can think of.
Lastly, this support forum is one of the biggest features of GP Premium. I’m confident in saying that we provide the best support in the industry – it’s something I’m super proud of.