How does one handle blogging or RSS feeds on static sites?

Agree, WordPress is slow and the basic barbone woocommerce plugin is just horrible unusable. To get something decent you need to install some 10+ woo plug ins and some other Wp for security etc etc… I am starting to use shopify for ecommerce.
It would be awesome if pg could facilitate the integration of a open source flat file cms like grav.
I have clients that needs very basic cms and creating a theme for Wp is just too bloated for the purpose.
https://sitecake.com/ have you ever heard of this one here?