First, let us agree on that this suggestions forum is one of the busiest and most chaotic forums in existence. The more chaotic something is the more it benefits from being provided a structure.
There will always be people that through malice or stupidity break a system, but striking beneficial functions because they CAN be abused is not a relevant argument, just as we're not striking requiring thread topics because someone can abuse them and enter "genital pie" as a title for his suggestion about burning undead moose.
Advantages:
* Provides structure
* Facilitates browsing for favourite topics
* Facilitates archival of and finding threads
* Helps searching for particular threads
* Helps scanning for already existing discussions on topicd
* Offloads manual categorisation that Toady does now
Disadvantages: None that I can see
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@Silverionmox: "It's impossible to tell which direction a thread will go before it has started. Tagging threads would be good with hindsight, for archive purposes
I think prodding those who commit threads with unclear titles to clarify them - possibly with tags, why not - should be sufficient.".
First, prodding people will not work. Unless there already exists a strong culture of tagging threads it will not happen later on. Also, people that can't create a good name for their thread will not be very likely to provide a good category for it either. Thus, a set of common and recurring labels (and an option for a custom one) will help with both these things. Secondly, you inadvertently argued my case for me: updating the category in hindsight is a good thing, and beneficial for archival (searching) purposes.
@Footkerchief : (a) "A notification saying "Please title your thread as clearly as possible" along with a more prominent "Search first" would be enough." ... (b) "people will miscategorise, bitch about miscategorisation, and not read a 26-page guide on categories"
About (a), no, and no. We already ask people to name their threads reasonably, and search first, and they don't and don't. Since people name their threads poorly, fail to search first, and generally have no ability to structure, we need to help providing that structure. As for (b), there are only some ten or so frequent topics. Perhaps 15. Not 26 pages of topics. Yes, there may be some bitching, but then, there is already bitching about topics, drift, whatever.
Again, we should not strike a good feature because of the potential of arguments (there is always already arguments about everything). We do not strike a good feature because it CAN be abused (every feature can be abused, it is a question of how much a benefit it brings over any potential disadvantages, and here the certain benefits outweight the possible disadvantages enormously). Finally, we NEED a feature like this in this forum.
@Granite26: "same people who don't read guidelines"
Yeah, and that's why we enforce using categories, making selecting one mandatory for creating a thread. We help provide the structure they need, or help people understand what they're intending to ramble on about.
@winner: will not happen. Mods here are extremely hands-off and will not sticky or (usually) edit threads in any way. The reason for requiring categorisation is that most threads/suggestions are about a few continuously recurring particular things. The tag would emphasise this, and facilitate finding and browsing topics of interest, especially combined with Tormy's suggestion about clicking a tag.