My thoughts are that maybe the yeast gathered this way may be less viable but you'd be leaving behind the hop trub. Maybe moving to secondary a bit earlier while there is still some decent airlock activity to get a better/bigger "harvest".
The best way I have found is to brew a yeast starter, split it off, save and brew another yeast starter (depending on how many times you have split it off). Way cleaner and way easier than re harvesting and rinsing the yeast IMO.
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