Do you want a program that costs $800-$1000, or do you want a program that costs as much as it does? The Sampler Track is meant to be a no frills drag and drop single snare sample (already edited) kind of sampler. You can export to Groove Agent SE or Halion SE for further tweaking/play ability.
It takes time to code everything and people to pay which is why they have broken up the features into different products and also so that someone who uses Kontakt, doesn’t pay the cost of Steinberg coding a feature rich embedded sampler right into Cubase.
These features are put into other products, to make the base version of Cubase (including the pro version) more affordable for everyone. It’s just a basic sampler, maybe it will get more features over time… but it’s just a stripped down no frills one-shot snare sample kind of sampler. If you want more than that… Well, you can pay for more than that because otherwise Cubase would just cost more to have it included which is what you are asking for.