Use the frontmatter term "collections" not "tags" to define which collections a content file should be a part of

[ironfish1000]

Is your feature request related to a problem? Please describe.

My feature request is related to a problem which I have posted about and described a solution for at:
Previous and Next links and collections #3861

Describe the solution you'd like

Instead of using eg:

---
tags: posts
title: Hot Take—Social Media is Considered Harmful
---

use:

---
collections: posts
title: Hot Take—Social Media is Considered Harmful
---

IMO this has the following benefits:

Although the docs at https://www.11ty.dev/docs/filters/collection-items/ say:

"Take care to note that tags have a singular purpose in Eleventy: to construct collections of content. Some blogging platforms use Tags to refer to a hierarchy of labels for the content (e.g. a tag cloud)."

when using eg Eleventy Base Blog v9 starter, tags are used also to generate taxonomies. IMO this is confusing.

Using "collections" would resolve this.

IMO, it is widely accepted in SSG's and CMS's to use "tags" as a way to apply taxonomy to content. I believe that using tags for taxonomy only would be helpful, especially to newcomers to 11ty who are used to "tags" as a way to apply taxonomy to content.

Using "collections" would resolve this.

In Eleventy Base Blog v9 starter, content files under the "blog" folder are all assigned the tag "posts" to make them part of collections.posts but this term also becomes a taxomony, and has to be then filtered out from being displayed using

eleventyConfig.addFilter("filterTagList", function filterTagList(tags) {
return (tags || []).filter(tag => ["all", "posts"].indexOf(tag) === -1);
});

Using "collections" would resolve this.

Describe alternatives you've considered

Please see my post about and described a solution for at:
Previous and Next links and collections #3861
IMO this solution is complex and took hours of trial and error to figure out. Using "collections" would resolve this.

Additional context

No response

[KajKandler]

Strictly speaking, tags are labels, not taxonomies. A taxonomy implies a hierarchy, which tags don't have.