Strawman proposal:

• Rename "Additional Hashtags" to "Project Name Aliases"
• Rename "Hashtags" to "Project Name Aliases"
• Rename "Tags" to "Projects"

Haven't spotted the term "slug" in the UI yet, at least.

Hashtags are not "aliases" - they are single words with # added at the start, that are references to a topic (project).

I agree that "Projects" and "Tags" is used inconsistently - they almost always refer to the same thing. I prefer "Project Tags" as the best choice, because that's technically accurate and simpler to understand (saying objects "are in" a project can confuse users to think about projects being "in" multiple projects).

assuming [additional hashtags] offers separate subcategorization instead of being name aliases.

I have no idea where such understanding comes from. Is it wide-spread? Maybe it's due to bad translation to some language? Is this a person that never heard of hashtags as used in practically all social media?

Found a related old upstream: https://secure.phabricator.com/T10326

In T15546#11801, @avivey wrote:

Hashtags are not "aliases" - they are single words with # added at the start, that are references to a topic (project).

That's likely true, however I don't expect most users to have a mental model which distinguishes between associating a "project name" versus one of a project's "hashtags" to a task.

I agree that "Projects" and "Tags" is used inconsistently - they almost always refer to the same thing. I prefer "Project Tags" as the best choice, because that's technically accurate and simpler to understand (saying objects "are in" a project can confuse users to think about projects being "in" multiple projects).

Same here; I usually use "project tags" in our downstream docs to avoid ambiguity between a representation concept in Phorge and an actual code project represented by that concept in Phorge (cf "email" vs "email address").

I have no idea where such understanding comes from. Is it wide-spread? Maybe it's due to bad translation to some language? Is this a person that never heard of hashtags as used in practically all social media?

It is not wide-spread. I've only been told once in a 1:1 with a new user of our instance using default English.

I was confused about why I couldn't tag a task with any random tag that I wanted to create on the fly as I'd do in Meta's Phabricator. It took me some time to realize that tags mean projects.