Hyva theme uses modern technologies such as Alpine JS and tailwind CSS which significantly reduces the dependency of heavy JS Libraries like jQuery and Knockout.js
Comparing with the default Luma theme Hyva theme takes just 500 ms. Where as the Luma and other takes 2500 ms which is a huge difference.
The code is clean and has more maintainable codebase with just fewer external dependency.
A developer can use modern tools and doesn't have to rely on heavy frameworks. This makes the developer to maintained the store reducing time and efforts.
The Hyva theme is responsive theme as you also get the flexibility to send the end pixels for each types of devices.
The price tag of Hyva theme is 1000 Euro however comparing to other vendor and their support cost looks reasonable. Its a one time amount.
The Hyva theme community is slowing growing and we can see developers are enjoying to learn this.