[OpenID] Why use SREG instead of AX?

[Timan Rebel / Rebelic]

I know what AX and SREG do and that SREG is more limited than AX is. But
what I can't figure out is why you would use SREG, when AX is superior?
Besides the fact that SREG is used by more Identity Providers... I've been
Googling on this for two days, but can't figure it out...
Can someone help me out?

with kind regards,

Timan Rebel
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