Some addons are standalone, and are able to run without any additional addons being installed; others can require certain other addons to be installed to work at all, or integrate with other addons to provide additional functionality. Collections of addons that have been put together to form a coherent user interface are sometimes referred to as UIs.
Now if there was a quest chain that I found to be a lot of work, it was The Prophecy of Akida. In those series of quests, I had to learn the language of the Stillpine furbolgs to help them reclaim Stillpine Hold. To complete the quest, I had to find four totems (Totem of Coo, Totem of Tikti, Totem of Yor and Totem of Vark) located in different parts of Azuremyst Isle. Along the way I encountered a lot of aggressive NPC’s. At one point, I was even simultaneously attacked by at least three of them. Needless to say, it was the second time I died in the game.
Anyway I will go ahead & download the Twitch app like everyone's saying, but I still need to know whether my in-game addon settings will carry over automatically, or whether they'd return to default same as if they'd all been uninstalled in the curse client then reinstalled from scratch. Because if it's the latter then I will have to take screenshots of the settings on all my toons BEFORE I install the addons thru the Twitch client.
But the thing about the waypoint is that it’s not always accurate. It happened when I was carrying out the Inoculation quest in which I had to kill infected owlkins and collect the emitter spare parts from the crashed ship in the Nestlewood Thicket and Nestlewood Hills. After I managed to kill owlkins, there was a particular spot in the area where the arrow turned green, telling me that a spare part was right there.
A lot of different types of addons are doing exactly the same thing. For example, Cross Realm Assist was an cross realm addon but in fact it is an LFG addon with its own UI. Serverhop and WQGF were doing exactly the same thing from program logic perspective. Even Badboy as a chat filter addon would filter LFG spamming. The idea behind BlockChinese could actually be used for premade groups as well. There is no point for people to install so many different addons for doing the exactly the same thing. These features should share the same code base and work together.
If you want to get rid of all of registries left on the program removal and don't want your Windows system is fill with redundant registries that someday may affect the system performance, you should perform a registry scan and clean with a sophisticated registry optimizer, it will help you clean all the useless and corrupted registry files on the system. 

But the thing about the waypoint is that it’s not always accurate. It happened when I was carrying out the Inoculation quest in which I had to kill infected owlkins and collect the emitter spare parts from the crashed ship in the Nestlewood Thicket and Nestlewood Hills. After I managed to kill owlkins, there was a particular spot in the area where the arrow turned green, telling me that a spare part was right there.
One fairly common issue people have is that older addons they install do not load when they log into the game. This is usually due to the fact that World of Warcraft tags older addons as out of date and aren't automatically loaded unless you tell the game to. This typically happens after a patch, as the game client tends to mark addons as out of date at that point.

So far it seems like the guides direct you to the easiest/best way to get stuff done. The waypoints they use are better than some other places because it tells you how to get to a certain place rather than saying "Go to X place" it says "Go out of the building and down the path" then once you do those things it says "Go kill X mob Y mob and Z mob until you have A items". It has given some pointers too for an area it was like "If you kill a lava thing it gives you a buff so you can walk on the lava" so it tells you to kill some lava things (JC quest in WoD)
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