Back in Symfony 2.x, the assets:install command looked for assets in /path/to/YourProject/YourBundle/src/Resources/public and copied (or symlinked, depending on whether or not the flag was used) those files to /web. Now that assets are stored in /path/to/YourProject/app/Resources in Symfony 3+, does the console command look there instead? Should I even bother using that console command at all?
According to the recent symfony best practice store your assets directly in web folder. Check this out: https://symfony.com/doc/current/best_practices/web-assets.html
This way your assets will be available without touching server-side commands. Also any frontend developer working on your project does not need to know anything about symfony, he will work directly with assets in web folder and templates in app/Resources/views