Ardennes is slower geography
The Ardennes lane should carry forests, rivers, castle towns, hikes, and the value of staying overnight. It is not simply the scenic part of Belgium that can be bolted onto any city trip.
That slower rhythm changes the reader promise. Transport margin, base choice, weather, and how much the reader wants nature all matter before attractions are listed.
Dinant is a gateway, not the whole region
Dinant is strong because it gives the Meuse a clear face: river, cliffs, citadel, and a compact town shape. It can be a first scenic move from Brussels or a gateway toward a deeper Ardennes plan.
It should not be asked to own every Ardennes question. The hub needs to keep the Dinant job focused so the city can be useful without becoming inflated.
Leuven and Mechelen are not interchangeable
Leuven carries knowledge-city energy, Gothic civic stone, University Library memory, Oude Markt beer culture, and green Brabant. Mechelen carries compact art-city texture: bells, Burgundian civic history, beguinage streets, water, beer, and difficult European memory.
Both can work for short rail trips, but the reason to choose one over the other should be visible. That difference is what makes the hub helpful.