Why Purdah is considered as a sign of backwardness?

Re: Why Purdah is considered as a sign of backwardness?

Naqab. I’m surprised that you don’t know about it 'cuz that’s another reason Saudis are critisized.
I’m not supporting hijab or naqab.
But I’d like to know how is naqab an indian/pakistani version ?
Sheikh Abdulaziz ibn baaz (chief mufti of saudi arabia before he passed away) said its naqab which was referred to in the quran.
So was he influenced by Indian/Pakistani cultural pardah ?