Phrasebooks optimise for immediate lookup
A good phrasebook reduces decision-making. It gives a complete expression attached to a familiar scenario. That is exactly what a traveller may need under pressure, and there is no reason to replace it with a ten-minute grammar lesson at the airport counter.
But immediate lookup and generative learning are different goals. Memorising “Could I have the bill?” does not automatically give a reusable model for every polite request.
Frames expose what can travel to another situation
A pattern library asks which part of the expression is stable and which part can change. It can connect several examples to one Frame, then link that Frame to a Move such as requesting, reframing or qualifying a claim. That makes the object useful beyond the original scenario.
The learner can still keep finished phrases. The difference is that some of them become evidence for a broader structure instead of remaining isolated entries.
The two formats belong at different moments
If you need one sentence right now, use the shortest route to that sentence. If the same communication problem keeps returning, extract the Frame and practise variations. Metkagram is designed for the second task: making useful relationships discoverable and reusable.
That is why its sets are organised around jobs and decisions rather than tourist chapters. The target situation may change, but the communication operation can recur.