"Even if true...."
... and it's not remotely true.
You will find panels over 52" on the market from LG, Samsung, Sharp, CMI, AUO.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.