This idea has been merged into another idea. To comment or vote on this idea, please visit WEBFLOW-I-4094 Able to Design Multiple Templates for CMS Collections.
Not being able to customize individual collection items (such as blog posts) makes using the Webflow CMS very limiting, or requires elaborate workarounds that still aren't flexible (designing different layouts that can be applied to items within a collection still requires designing the template elsewhere, and applying it to the item, rather than getting to make individual edits right on a collection item).
Some blog posts require different structures, or a full-bleed image, without changing the template for all items within the collection. This is the biggest reason I'm apprehensive to switch my site over to Webflow.
Maybe this could be structured like an override field? Allow overrides directly on individual collection items?