How strong is that dependency? I've set up a few things using Stack, but as far as I can see there's nothing that would stop me just downloading the intended v

How strong is that dependency? I've set up a few things using Stack, but as far as I can see there's nothing that would stop me just downloading the intended versions of GHC and the various needed packages from Hackage if Stack went away tomorrow. Are other projects more tightly integrated in some way, such that backing out in the event of catastrophic failure of the Stack ecosystem would be unreasonably or prohibitively difficult?