Two times a week is rather exaggerated. Authors who follow what WordPress is actually doing do not have such issues. When there are security updates with WordPress, sometimes there can be a surprise release. But that isn’t the norm.
Envato can make such requirements. I personally believe Envato chooses to include items that aren’t kept up to date. I believe, it is poor judgement selling items you know aren’t up to date, and authors who choose not to keep items they have in Elements current should have their items removed. Those authors should not receive compensation for items not kept current.
Boasting of multitudes of items, regardless of quality keeps me from purchasing, even with a sale on. I am one who is more interested in WordPress items more than anything else. So, I won’t purchase. I believe there are a lot of people who think similarly.
Envato is about making money above everything else. That’s pretty much the gest of it all. In my opinion.