"Ulf, hardly any inspectors actually do a test drive during an inspection! The requirements are minimal: sufficient ground clearance, proper wheel function, use of approved components, and compliance with the wheel rolling circumference, or, if necessary, documented correction of the speedometer reading. Since the introduction of ABS and ESP, the wheel rolling circumferences have been the same on both axles. There's really not much else to check!"
It's all the more problematic that the sometimes life-threatening suspension settings of some amateur tuners often go unnoticed for a long time, or at best, the driver might only be alerted by an ESP system that intervenes far too early. Ideally, the suspension settings, tires, and ESP should work together, with the ESP intervening late and only making subtle adjustments. The earlier the ESP actively participates in the driving process, and the more aggressive the interventions, the worse the overall concept. Unfortunately, many manufacturers now tend to use the ESP in a way that prevents the vehicle from being "brought back to life" in the first place.
Example? Try driving a current Smart... ESP intervention with every sharp turn, preventing a quick 180-degree turn on a two-lane road. The car could, if it were allowed to!
Regarding the Cupra, I suspect that the "marketing" aspect is behind the very stiff suspension. The buyer is interested in a sporty small car, and they want value for their money! That's how you end up combining features based on what is perceived or demanded by potential customers.