SCART was pretty great but not perfect.

I lived part of the 90s in Europe and you really had to know where to buy your cables if you wanted the best quality. It was essentially a prequel to what we have now with USB-C. Not all cables had all pins wired up, you often ended up with composite quality. S-VIDEO support was very poor, you had to manually select it and not all equipment would accept it. Not all cables were shielded. Some equipment really hated hotplugging so you had to be careful with that too.