Not all questions are system based nor do specific question need answering within a system's framework. Therefore, forcing a system tag would not be a good solution.
I am unsure if we can add a [system-tag] macro in comments that would suggest adding such. Edit: apparently, this is not possible, see comment.
We could use a pro forma comment. It could read:
While action-economy is a subset of actions, it is a very specific subset that, at least in D&D, has a really important role in how the game is played.
Action-economy is about how to do more things in a round than the game would mandate. It is about why we don't pit big, lonely monsters against a party of 6. It is about balancing a game, it is about ...
The most effective solution is to have the main page and existing question pages model the correct behavior visibly and clearly, by making system tags a more prominent part of UI. Users should see that the site expects and cares about system tags long before they're hovering over the "post" button on a new question, without having to read guiding comments or ...
The pixie tag is fine as-is. No action needs to be taken.
We do have race tags: see elf, dwarf, tiefling, etc. It's fine to also have a pixie tag.
It should not be a synonym of monster because it is not a monster. It may be ascribed a mechanical treatment of monster-ness in some game releases, but we need to look at this more from a generic point of view.
Per our help center:
What are tags, and how should I use them?
A tag is a word or phrase that describes the topic of the question. Tags are a means of connecting experts with questions they will be able to answer by sorting questions into specific, well-defined categories.
Tags can also be used to help you identify questions that ...
The tag is underused
I'm never a fan of removing/synonymizing tags simply because we don't think they are useful. Someone found that tag useful or it wouldn't exist. It's existence isn't doing any harm so we should leave it be.
I did a search for questions that mention action economy but have neither the action-economy or the actions tags and found 70 ...
There is nothing special about shape water which merits one, so we shouldn't have one for the reasons already given in that meta.
However, we can save our precious diamond mods the effort and just make it a synonym. This is already done for tensers-floating-disk and tiny-hut so we can just do it with this one too.
Thank you for taking the time. To help out, I've taken a first round crack at providing some tag guidance on the following:
occult-magic and by synonym psychic-magic
These edits were based on your discussions within this question and your cited answer; I'm not an expert on either PF or psionics so I'd appreciate a ...
Yes, questions about CR calculations should be homebrew-review questions; asking whether something is balanced is sufficiently similar to asking when something would be balanced
The current description of the homebrew-review tag is as follows:
For questions about evaluating the viability of new rules content homebrewed for an existing system. This tag ...
We won’t be changing anything right now
The system restrictions around changing this field means that we have no realistic options for changing the tag recommendation text in a way that meets our goals. Our most practical option is to lock one of the tags to [dnd-5e], our primary suspect, but we will be unable to measure whether that has any practical ...