Hey sarora27, Magento is certainly more of a monolith - so if you're building a Magento site you're very much building a Magento site. Shopify is similar in some respects, although their headless offering has certainly opened the doors up a bit.

The real benefit at the moment is that you can get Commerce running with the site you already have - you don't need to replatform in order to start selling things. Additionally, the cart is entirely real time - so a user can go from their laptop to their phone without needing to refresh the page to see any changes to the cart. Finally, the core of the cart is vanilla JS - so there is no inherent need to use React/Vue/(enter JS framework here) - although you certainly can by hooking directly into the API if that's where your tooling is at.

It's also ready to rock for static websites - no backend required - that was the initial drive for the product itself and it's grown from there.