KISS - keep it simple stupid, is a bad advice given to traders in terms of developing a methodology to trade.
There are two parts of methodology - 1)Analysis 2) Strategy. Analysis is the part where you spend most of your mental energy and strategy is where you develop a plan to execute your ideas.
So , keeping analysis simple is never a good idea. You should look at a lot of things before even developing a plan. For example, you should look at your indicators, momentum , trends or range, similar market movements, price action, time/volume etc (just an example) and form a VERY CLEAR analysis on what you are going to do. You should know the ins and outs of your analysis. This consumes a lot of mental energy , especially for beginners.
And this is just the beginning. Next, you should develop a strategy, trading plan , trade management after trade open , write your journal and thoughts. It might be easy to some people but trading really takes a lot of mental energy for me.
Instead of keeping it simple, I prefer to have a very specific and clear analysis for my next trade no matter how much time it takes.