UDIM vs UV sets ?

SebKaine
node
Hi guys,
Sorry this is a stupid one ...

What is the advantage of UDIM's over UV sets ? 

For exemple :
- i have a props
- i need four 4K maps to texture it
- what is the advantage / difference of using UDIM's over 4 UV sets ?
- UV sets are recognized in every renderer like webGL / unreal , UDIM are nots
So if everybody in VFX use them , there might be a reason, but i don' t get exactly why ?

Thanks for your lights
Cheers
E

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