A Kingdom Hearts 3.5 compilation would give Square Enix the opportunity to mix and match mainline games and mobile spin-offs in interesting ways.

In Kingdom Hearts Dark Road, you play through the past of a young Xehanort and Eraquas, and there aren't many Keyblades available. There are three that appear, but two of them are duplicates.

One major Kingdom Hearts version risks becoming outdated with the release of Kingdom Hearts 4, highlighting the need for a new release of its kind.