The bottom line is that you can use foil for many of the same things you would use parchment paper for, but it doesn’t mean you always should. If parchment paper is for hot use, and waxed paper is for cold use, think of foil more as your alternative for insulating use.
Also, do you have to use parchment paper for rosin?
Without quality parchment to catch, contain, and direct the flow of rosin, you’d end up with a sticky mess on your plates and press with no good way to collect your ruined rosin. Parchment paper protects both your rosin, your press, and your plates.
Whether you prefer to use Flower, Hemp, or Kief, a Rosin Press will ensure you get the best dabs possible. Some users simply use a hair straightener for extracting Rosin, but using a Rosin Press is a much better option. Not only is it safer, but the Rosin you’ll make will be significantly better.