I love Elpaca! The built-in package management story has gotten so much better in the past 10 years, but Elpaca is so, so good. My personal config is kinda the antithesis of Bedrock—it's bloated, slow, and uses over 100 packages. Elpaca handles installing/updating/managing those like a charm, however.

I kept Elpaca out of Bedrock because I wanted a strictly built-ins-first experience, but if anyone asks what I use when they outgrow package.el, Elpaca is my first and only recommendation.