Whether creating Opencart custom theme is necessary? - wordpress

I was working in wordpress and now I have to work in opencart theme customization. In wordpress, creating child theme is safer to override .
Here in opencart, is it necessary to create a custom theme to override the default theme?
I'm customizing default theme only, not creating a custom theme. Any advantage or disadvantage to this?

You should not customize the default theme. You should copy the default theme to a new theme, and customize that. If a page is not found in the custom theme, opencart uses the page of default theme. So best practice is that you should not change the default theme. Instead make a copy of it and use that.

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