For full transparency: I've started and stopped putting an answer here a few times about potential edits to the question to make it on-topic. I ended up requesting clarification on the question (in comments) about the intent of this meta question, and received a response that it was focused on the on-hold/reopened back and forth from a day or two ago. I took this to mean to just work on the question itself and let the normal re-open process play itself out that's triggered on edit. What I didn't notice was that response being edited to include "but let's talk about anyway" (paraphrasing). Oops. Well, the Internet hasn't exploded yet, so let's get on with it. The moral of this particular story: don't react to anything on a Stack Exchange site until it's been up for over 5 minutes.
I made an edit to the question specified that replaced
Which game starts this trend, which game solidified it? Does this trend come from outside gaming?
which is a clear request for game identification and specifically discouraged in the gaming-history tag to
Why and how was this introduced in gaming? Does this trend come from outside gaming? How did this evolve to become a trend that almost all games began to follow?
I felt like this change made it on-topic according to the gaming-history tag. The tag's summary states (emphasis mine)
Questions about the history of games, conventions, customs, traditions and gaming terms, and how they have developed over time.
I would argue that with item rarity represented by color being so common in new games that are published, it's now a common gaming convention. Additionally, in the detailed description it says
An ideal gaming-history question will usually begin with the word why or the word how.
Also, the question now avoids
Lastly, avoid questions that ask for the first game that did something. These questions are too narrow for gaming-history.
It's now not narrowly asking about a specific game, which broadens the question a bit.
However, since making the edit, 3 people have now stated that the question sounds like a developer-intent question. To me, this actually shifts the conversation from the item rarity color question to something completely different: what kind of gaming-history questions are on-topic? If we can't ask about how or why a gaming convention came to be and how it developed over time because it's "developer intent", then just what kind of gaming-history questions should be asked? And what sort of changes should be made to the tag's info?