Not true
Newer, 1995 & up, are designed so the "O" ring in the bore actually pulls the pad away from the rotor. If you experience drag with a set of discs, you have other issues that need to be addressed.
Sticking slides,
bad calipers, (rusty inside, or worse)
bad hoses,
master cylinder not releasing,
Or something else entirely.
But
drums can be adjusted for zero drag,
be aware though that your automatic adjuster will bring right back up if it is working well.
just some insight,
S.
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Albert Einstein
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