Allow for Denotation of Stream Game categories by a "Game - Series" Format
A big issue with discoverability on Twitch, especially with retro or niche topics, is through how Categories are currently handled. When categorizing what the stream is doing, there is only two extreme options of the exact, specific game ("Pokémon Scarlet/Violet" or "Final Fantasy XII Remake") or the broadest topic of the game ("Retro" or "Games + Demos"), with no middle ground to help summarize things and no choice to have more than 1 game in your category. Along with this, retro titles (Such as older Final Fantasy games), are basically screwed into being a part of the extremely broad categories because the amount of people searching for a specific retro game is very small to none.
Therefore, I first suggest that there should be an ability to categorize a Series as well as a game for a stream. Take for example: "Bomberman 64 - Bomberman, Final Fantasy XII Remake - Final Fantasy, and Super Mario Sunshine - Super Mario. These can be simple changes, but it can mean a lot in searching for these streams.
Taking Pokémon for example, it's very noticeable that streamers playing older games, such as Pokémon Heart Gold, will instead categorize themselves under the newest Pokémon game, take Pokémon Scarlet/Violet. This is because people would mainly be searching for the newest game, increasing the odds of viewers finding the channel. And, if people are searching for the older Pokémon games, they must search through each older Pokémon game 1 by 1 to find a streamer they like.
This is where the category of "Series" comes in as if a person can just search "Pokemon", any streamer playing Pokémon will show. And, if a person just wants a certain Pokémon game, the option to search for the specific game is still there through the “Game” categories. This lets streamers play and categorize whatever game they want without worry of the algorithm screwing them out of viewers.
This idea could also branch out to the other topics of Twitch, art, music, irl, etc., as this format can work in denoting what type of topic instead of just the topic ("Type - Topic"). Take a makeup stream for example: Having the stream be categorized under "Makeup - Art" can allow for a higher chance of viewers seeing the stream by either searching for makeup specifically, or through just searching for general art. "Metal - Music", "Wrestling - Sports", the list can go on.
I'm hopeful this idea can be considered as this could help increase viewability and help decrease the worry of the algorithm for streamers. Also, allowing for a category that is neither too specific nor too broad will greatly assist in viewers finding the stream that they want.