They didn't put any of this in their polling.If it were a popular idea I think it would have been revealed in the extensive polling and surveys they do. I'd be surprised if they didn't also pay close attention to what's selling on DmsGuild. Heck, if you think people want it so much, start a thread and set up a poll. The fact that very few people seem to agree with you should be at least somewhat indicative.
The 2nd highest Gear book on DMGuild is the Weapon and Armor addition and variant. It's 3rd for the entire site.
The idea that few wants this variants are false.
It's not splitting the market. It's offering options.There is also, the issue that, an optional set rules, @Minigiant wants amounts to splitting the market. It would be a case of Wizards creating something that completes with its own product. A big marketing No,no
It's like how every burger places is offerng a chicken sandwich and many offer a plant-based burger.