The Challenger has basically not changed since 2008, as shown above.
Although a 2015 facelift included a new infotainment system and other small changes
to the front and back design, technically speaking, not much has changed in the intervening 15 years.
The Challenger has maintained its popularity despite its outdated design,
therefore the saying "if it ain't broke don't repair it" definitely applies in this case.
Additionally, the ongoing introduction of new, more powerful engines has contributed to excitement.