it's actually a criteria of twice flopping that nobody ever mention but it's actually true
and there's actually a term for this it's call "launch fatigue/ marketing fatigue" the fact of constantly spamming the market with your product is a good thing on the really short term which is the reason of Twice very successfull 2-3 years
but on the long term it have only bad sides, because the consumer gets tired, your product become banal and lost the attract because they are used to see your product, you're not building enough hype between the 2 projects so it end up in consumer being less excited for their comeback, the consumer consider this "spam" of product as a low quality product because they consider that if they are able to do so quickly they don't have much quality compare to another company who take their time to launch their project....
I think it's what mostly happen to Twice
Marketing Fatigue + the fact that JYP haven't been able to give them a concept that feels aesthetically interesting enough to build a lot of hype