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The biggest misconception due to this is the fake principle of 'ELO Hell'. The idea is that you are unlucky and get worse than average teammates which result in you not advancing in LP, ever. This doesn’t exist.
The reality is that being good at LoL is extremely multidimensional, as you've probably figured out from the guide.
For example, it’s easy to look at your Kill/Death/Assist ratio and notice that yours is better than your teammates. This leads you to think that your teammates obviously died too many times and that you played better, but perhaps you didn’t back them up enough. Maybe you didn’t do a good enough job zoning the top laner, ganking, or last hitting.
There are MANY reasons that games are lost, but the chances of you getting unlucky with allies is the least likely one.