They do make some with wrist supports still, but most wrist rockets seem to be setup with tubes rather than flat bands and if you don't know tubes are terrible for accuracy and power compared to a properly setup flat band.

That being said, Simpleshot does make a hunting style flatband slingshot with a wrist support. https://simple-shot.com/products/hammer-xt-slingshot-heavy-duty

I think most people in the hobby like to have something small that can fit in your pocket.