Short answer would be: sole solo developer experience (DX). Longer answer: avoiding infrastructure setup - for those who has infrastructure it makes no sense,

Short answer would be: sole solo developer experience (DX). Longer answer: avoiding infrastructure setup - for those who has infrastructure it makes no sense, for those who knows how to run things in Docker and not need much beyond it - eliminates the need of getting familiar with Docker Compose. Having php stay in memory should make performance benefits [and make sense for the project], but that's different story.