Btw docker is only standard for CI systems. Never would I advise anyone to actually use docker for local development let alone 10 docker instances at once. It's just pure insanity.
There are many alternatives to docker which don't cripple your computer. Nix is the best one.
Whether it's having to run a lot of Docker containers, a large C++ project, or a large Webpack project.
Nitpicking and criticizing someone's dev environment is irrelevant.
If you don't like their example, I'm working on a JS project where I run a lot of local VMs to locally test the web client in different configurations. It would continue to be a bizarre response if you thought it was time to tell me to "just use browserstack.com" or something. Software isn't as easy as we think.