[blittle]

If liquid is what you know and love, 100% stick with it. Liquid isn't going away, and there are plenty of opportunities to build out liquid storefronts. Hydrogen is built for custom storefronts that need more flexibility than what is available in a liquid theme. It's entirely customizable. Hydrogen has better performance capabilities as well, because it can be stream rendered to the client.

"Why shouldn't I stick to server side rendered pages?"

Hydrogen is still server rendered. Server components themselves never execute in the browser.