Is it safe to use Composer command for an initially non-Composer Magento 2 installation?

Ask your questions
, ,
1

In my local system, i am not using composer install magento package.

I just download the zip file from Magento dowloads and using it.

In this case i use composer require and composer update is not affect the exists file system?

While running the composer update it will update the only mandrill lib files?

2

Using Composer for an initially non-Composer Magento 2 installation does not break it.
I deploy my extensions with Composer and never met a problem with the non-Composer Magento 2 installations.