@soix I have had over 10 high end HDMI cables. The better ones were probably Wireworld Platinum Starlight and Nordost Heimdall 2 HDMI. The Vivlink 3+ was better than them all.
Regarding length, don’t be so sure. For HDMI and USB cables, which are data transmission cables, its found the reflections and resonance points have an effect, e,g many are finding a 1.5m USB cable to sound better than a 0.5m
I guess it depends on the cable geometry itself. But a hard and fast rule that shorter is absolutely better is incorrect.