I am no designer but it does say here https://help.market.envato.com/hc/en-us/articles/202821580-File-Packs-GraphicRiver the minimum for print templates is 3 items per pack - could that have something to do with it?
For what it’s worth the reviewers are not chosen lightly - they are all experts in their field as well as having expert knowledge of the marketplaces to know what does/does not work.
Of course there will be times when people don’t agree with the decisions but (and it has been discussed a million times):
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Someone has to be in place to make the call to maintain the quality standards which set envato apart from other marketplaces - it does not matter who/how this is done there will always be a level of subjectivity involved
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There is already a huge backlog in submissions, partly driven my sheer numbers including by many files which are nowhere close to the standard. If reviewers had to explain the cause of rejection every time the queues would be unmanageable.
On top of this - what’s to say (using a web template as an example) a reviewer says the “typography is not up to standard” - what guarantee does that give that the author will have the skills to make it right? What happens when an author feels they have addressed the problem but it is still not good enough?
The simple fact is there will always be apparent improvements, but it is important to consider the bigger picture