I just started using the Supply theme a few days ago. If I go to edit the code this is popping up at the top of the page. I'm not a code expert but does this mean that the code this theme was built/written in will no longer be supported and should be changed?
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This is an accepted solution.
Shopify is deprecating sass going forward. The reasons are listed here: https://www.shopify.co.uk/partners/blog/deprecating-sass
The message is mainly for Theme developers who use sass to compile CSS. For now, since Supply is a free Shopify Theme, you do not have to do anything. Shopify will update and transition the Supply theme's CSS from .scss to .css as stated in the link given in the message.