Several channels use third‑party libraries to expand the emotes available. These emotes can be used for free by anyone installing these libraries, and these emotes acts like the viewers are subscribed. These streamers encourage their viewers to install these libraries.

Issues arise where it creates a divide between viewers who have and viewers who don't have these libraries, and having viewers rely on third‑party extensions for their Twitch‑viewing. Some of these libraries are also fighting and creating a worse experience when multiple libraries are combined. Viewers can also install a third‑party Twitch‑app on their phone to see and use these emotes as well, which is also a security issue. Furthermore some viewers think these libraries are part of Twitch itself, and some expect all channels to have these by default.

I do not ask in any way for Twitch to try to prevent any of this. These libraries will just go around any attempts done to stop them. People should be free to use these libraries if they want. But how common these libraries appear to be used by streamers, it does show a lack in Twitch's offering.

So the current system of only having 5 follower emotes with a slow increase of subscriber emotes as the channel grows, this encourages this kind of behaviour.

These small pictures should certainly not take much storage or network, so I'm not certain why Twitch is so stingy about allowing more slots, especially considering the efforts it takes to becoming affiliate in the first place.

Having access to a large number of tier 1‑emotes would encourage viewers to subscribe in the first place, which is beneficial to Twitch and the streamers. I have had viewers say they subscribe for the emotes alone, so I wish I had more than just 5 slots available.

Currently:
Affiliates have access to: 5 follower emotes (after approval for direct upload), 5–9 tier 1‑emotes, 1 tier 2‑emote, 1 tier 3‑emote, 1–5 animated emotes. The numbers expands to their max at 50 subscriber points.
Partners has access to 5 follower emotes (after approval for direct upload), 10–60 tier 1‑emotes, 5 tier 2‑emotes, 5 tier 3‑emotes, 5 animated emotes. the numbers expand to their max at 10 000 subscriber points.

I would love to see an increase to this:
Access to 5 follower emotes from the start, where emotes has to be approved the same way as tier 1‑emotes have to be approved. After you get approved for direct upload, additional 5 follower emotes could be unlocked. Then let affiliate and partners unlock additional follower emotes, as well as tier 1‑emotes at a faster rate. For example, affiliate could unlock a tier 1‑emote each 5 subscriber point for a total of 15 tier 1‑emotes at 50 points instead of just 9 as of now. Partners could start with 15 tier 1‑emotes and unlock a new emote for each 50 subscriber points for a total of 215 tier 1‑emotes at 10 000 subscriber points. Additional follower emotes and animated emotes could also be offered as channels grow.

Will streamers be able to use up all slots? Probably not. But it's better to have empty slots not filled with emotes, rather than having too few slots and having emotes left over. Because leftover‑emotes will go to these third‑party libraries instead of being Twitch's tier 1‑emotes. A streamer can also choose to not use up all follower emote slots, to encourage subscriptions.

Other services such as Discord allows you to start with 50 "follower emotes" and 50 "tier 1‑emotes", and as people subscribe you can reach a total of 250 "follower emotes".