They should do this again, but later on when couples are more established so the decision for the other to stay or go is actually hard. If they do it too early it's obvious they'll stay.
Remember with Georgia and Sam when they said they could either leave together or stay in the villa but not as a couple? That should be brought back as a rule for after Casa. If you recouple at Casa you shouldn't be able to then go back to your OG couple, otherwise the Dami/Indiyah Tasha/Andrew route of recoupling then ditching the newbie is too easy. Cba watching people flip-flopping around, make them accountable for their choices!