Yes, you are because some builds want non-core stats on their items. For example, Support Monks / Support Barbs might want items with INT as their main stat, as that provides them with extra All Resist for survivability. If items just had a generic Main Stat affix (which would grant an increase to a class’s default core stat), or the value was added elsewhere, this would prevent supports from doing this.
That would be possible if you want to also remove chc chd ad ias apoc rcr rcd…
Then you just need 1 of each items, problem solved. While they are at it they could also remove act 2-5 and all all monsters apart from one so you always know what to expect:)