Your method is still flawed. The bleeder screws have threads that even when mechanically sealed can leak air. As soon as that pedal comes back up, that piston retracts and guess what displaces the fluid. . . .
Depends. 2 things it is REALLY useful for.
1) from freezer to stove, no more defrosting woes. This is for any animal.
2) Chicken becomes edible. Cooking it at 145F is SO MUCH FUCKING BETTER than any other way.