Idea Factory LEs are the worst lately. I hate it when CEs don't ship with the game and the CE stuff in the same box. It's like you get the game + a grab bag full of crappy trinkets. I've stopped buying beacause of this.
It's the same stuff either way, so personally that doesn't bother me. If you can just buy the game standalone for any CE your options are always "game" or "game plus crappy trinkets".
I like that they sell the leftovers separately sometimes for a reduced price. Sometimes you can get just the extras if you already bought the game during one of their sales for a good price.
Regarding the Steelbook sizing, Steelbook is used as a general term amongst people kind of like Band-Aid is to bandages but Steelbook is actually a trademark/a company. I suspect that by doing a different size they're avoiding having to involve and pay fees to Steelbook? I don't know if Steelbook has any claim to the size via a patent or whatever, as silly as that sounds (though there are Switch size actual Steelbooks too like the No More Heroes ones). All I can see is that they're avoiding making them actual Steelbook®'s for some reason. You may notice they themselves don't call them steelbooks. It's just 'Steel Game Case'.
I get the complaint about uniformity so I'm not dismissing it as invalid, but for myself I don't mind the size. I want a shiny metal box and I get a shiny metal box.