XPages are here, they're big and bad and scalable. They integrate with @Formulas, which is extremely powerful. For things like repeat controls, type-ahead, etc. there are times when you use @DbLookup or @DbColumn.
But these functions are limited in returning 64K, like the days of old.
Two new @Formulas, @DbColumnBig and @DbLookupBig should be created to be able to return large amounts of data.
Presumably to incorporate this capability into the legacy design elements (<computed text>, fields, etc.) this would be a large amount of effort because of all the other 16/32/64K limits on those elements. To ease the engineering effort on IBM's side the new @Formulas could be made available only within the context of XPages, similar to how @Unique has a completely different implementation on XPages than it does with legacy Domino design elements.