Why are so many Power Meters limited to 2000w?

No need for people exploding and shouting "Only 1% of the human population can reach above 2000w so whats the point I hate you! this is a useless thread AARRGGG!"

All power meter manufactures claim that accuracy increases with higher wattage output, so why the limit?

Is a SRM Science and Infocrank the only +2000w Road option?

Can a Garmin Vector read 2000w per pedal and thus actually capable of reading up to 4000w?