Disagree. Viability has nothing to do with rating or ranking.
Sunfire Aegis is a good item on
Renekton regardless of what Elo you're playing at. Deductive reasoning and logic is all you need to write a guide and every player should always ask themselves "Why am I doing this?" because that's all that matters, not rating. Any player can understand mechanics without being able to perform them.



GrandmasterD wrote:
Disagree. Viability has nothing to do with rating or ranking.


That's one of the main reason's I put in the section about professional talk. I know plenty of friends who are very knowledgeable about the game, but do not perform very well. I will try to get this message across more though.
I think that understanding decisions is also pretty important and that was partially added in when referring to pro player builds.
I know there are guides out there who are written by people who may not be able to perform at the same level of their understanding, and if they reasonably reference a couple pro players/decision that he/she learned from throughout their guide, then that should help people believe that he/she knows what they're talking about.
I agree that ranking does not strongly affect the content of the guide because you do not have to have a high rating to understand a champion's mechanics. However, proving that you know what you're talking about to your readers in anyway possible whether it be by using your rating or referencing pro-players allows for readers to trust what you're writing a lot more.
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For people who are higher up in the league system, establishing your credibility is pretty easy. Its just as easy as verifying your ranking for the most part. Sure the additional statistics that you can pull out to establish your credibility further is great, but proving to people that you're part of the top percentage of LoL players should be fine.
Now for people are not as high up in the league system, you will have a much harder time establishing your credibility as a guide-writer. The first thing that you need to do is explain why you should be listened to over somebody who has a significantly higher rating than you. There is a lot of ways you can support your credibility without having a high ranking, here are a couple:
Conveying these statistics to your guide-readers is also very important as pointed out by Veng Lmfao. You need to make sure that you don't come off as overconfident or stubborn when presenting your credibility, but rather you should try to come across as knowledgeable and welcoming. If you come off stubborn when writing your guide, most people (including me) will just not review your guide in the first place. Showing that you're stubborn and are not open to other ideas means that the likelihood of you listening to suggestions from others is slim to none.
All in all, every guide writer should make an attempt to prove to their readers why they should follow his/her guide instead of others.