I don't think there is the "correct", "approved" and "only" way to pluck. I've found it depends on your fingers (not everyone's fingers move exactly the same way), the tone you are looking for, the length of your fingernails and a bunch of other stuff like the strings you are using.
I've read about, and often use the "slip the string off your finger and let your finger come to rest on the next string" technique. Works in some instances - mainly when a want a very smooth silky kind of tone (like when playing 4 beat sustained notes for a ballad singer), but pretty useless if you are trying to dig in and get a tone that pops out at you more in a rocky tune. In those instances I find myself using more muscle in my fingers, getting my fingertips a bit more beside, or almost under the side of the string and letting the string pop off my fingertip.
Neither of those techniques work in precisely the same way on my upright.
YMMV
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Steinberger NXT5 EUB, MTD 535 Fretless, Tobias Killer B6, 72 Fender Precision
Eden WT500, WTX1000N & WP100, QSC PL230
Eden D410XLT, D410XST, 215, Fender Bassman 10
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