Is RAZZLE_API_PATH required to start Plone 6 on Docker?

I'm trying to setup Plone 6 by Docker, Containers – Install — Plone Documentation v6.0

I think we don't need to specify RAZZLE_API_PATH , becouse I want to use Seamless mode on the Docker env.

Why is this document it set up the RAZZLE_API_PATH ?

Doument is below:

docker run --name plone6-frontend --link plone6-backend:backend -e RAZZLE_API_PATH=http://localhost:8080/Plone -e RAZZLE_INTERNAL_API_PATH=http://backend:8080/Plone -d -p 3000:3000 plone/plone-frontend:latest

My idea is below:

docker run --name plone6-frontend --link plone6-backend:backend -e RAZZLE_INTERNAL_API_PATH=http://backend:8080/Plone -d -p 3000:3000 plone/plone-frontend:latest