Google Docs isn’t near the same as Notion. Not even close.
Notion treats information as a repository and keeps things indexed, searchable, and has some ways to automatically sort things, has ability to seamlessly create different types of documents and weave them together and so much more that Docs lack.
Docs doesn’t even have native markdown support last I checked
You can use Markdown in Google Docs, but it automatically gets converted to rich text. (When you copy/paste rich text out of Google Docs, there's also a "Copy as Markdown" option, but it'll default to a particular Markdown syntax that may not be the one you refer.)
