That is not a fair presumption. If you're on a Linux laptop a Dockerized app has effectively no performance decrease. If you're on a Mac, a VM and Docker does

That is not a fair presumption. If you're on a Linux laptop a Dockerized app has effectively no performance decrease. If you're on a Mac, a VM and Docker does impact raw IO. My anecdotal experience developing like this every day is that it does not cause noticeable waiting. There are other downsides to Docker-based development, around tool complexity and stability. In my opinion this is no worse than tools like Homebrew or rbenv. There are also productivity upsides.