The whole folder structure thing should be a guideline and nothing more.
In fact, there should be two or three desired folder structure setups we could use as a guideline and allow us to move freely between them to create the structure we deem best for our package.
We should only be warned if the whole structure is an unorganized mess, not when we spend hours structuring it, making sure it all make sense just to hear we have to adhere to one specific structure that does not make sense in all cases.