You can become a master in the house of Telvanni while being a follower of Imperial legion and also part of the Imperial temple while being a grandmaster in Fighter's guild. For retards spouting muh realism very little thought goes into thinking through how much work it actually takes to be part of an organisation beyond an entry level position. All of this can be achieved by speccing as an Orcish thief and having no major or minor skill in magic or fighting and merely spamming trainers until you meet the criteria required while doing quests that are basically a factory for fetch quests. But muh realism! while being a leader of 4 different highly complex and influential organizations.
This is a fair criticism to make, all the more because there is little to do once you're the head of a faction. Others I can kind of understand in the sense that the native Houses are not going to block your advancement forever just because you hold a low-level membership in an Imperial guild. Being grandmaster of all of them is pretty retarded though, I must agree.
Clearly there was some thought put into this, what with being unable to join the Thieves Guild if you took the code book. But apparently this was not really worked out for other factions besides the Great Houses. I never understood why the Temple and Imperial Cult are not mutually exclusive for example, considering they have similar skillsets.
I'm pretty sure that the faction reputation system was meant to put a stop to, or at least discourage things like this, but they didn't really implement it properly. I don't have time to test it, but I'd imagine that if you went through the entire Telvanni questline and didn't increase your base Personality, people in the Mages Guild would hate you enough to simply not speak with you, and vice versa. Problems like this are solved by the broken economy and the player's easy access to thousands of gold for bribing people. This system also didn't stop players from simply joining all of the factions early on, before their reputation is strong enough to really piss anybody off.
Edit: Also I'm pretty sure that a partial justification for the player being able to become head of so many factions (and so quickly) is that Vvardenfell is a shitty, backwater hellhole. It's where the factions send their idiots and fuck-ups like Trebonius, so that nobody important has to deal with them. The only exception to this is House Redoran, who moved their entire council onto the island.
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