A big range is only useful if the parts behind it are organised. Otherwise it is a warehouse of orphans.
One firmware family
Every model in the range shares the same app, credential model and offline logic. A dealer who learns one can sell all of them.
One spare-part discipline
Panels, bodies, sensors and battery packs held for the production life of the model. This is what makes a 419-model catalogue sellable instead of intimidating.
One test regime
GA374-2019 and GB21556-2008 across the range, salt spray on the metal, ESD on the electronics. The report pack is the same document with different numbers.
What the distributor actually buys
Not 419 products — 6 series they can explain, and the certainty that the door they sold last year still has parts this year.
Takeaway
Range is a promise about the future, not a list about the present.