In terms of the sectarian divide the Saudis caused in Pakistan, you have to look at the Saudi's in two groups. The divide was pretty much started Pre MBS, who were funding Wahabism in Pakistan and had opened up Madrassahs which were brainwashing men and women. Families had gone so crazy that if you had a child called Rafay and you called him that, their mothers would start attacking you saying that because its Gods name, so say Abdul or dont say his name.
Anyways, since MBS has came in, the funding for these madrassahs have died down and the sectarian divided that Wahabis created as slowed down abit. But they have implanted the grass roots of it.
Im not defending MBS, he had Kashogi murdered, but as a liberal leader he is still better than the ones before him. From pakistan's pov, as long as he doesnt spread and fund wahabism over here and moves his own country towards more liberal aspects by opening up the country i am fine.
Yes, Pakistan does get dragged down by them but that is because we ran after them for Aid and had our economy held hostage by them..
Our problem with Iranis are the safe heaven they have provided to Indian Spies, Baloch seperatist, Karachi/Balochi gangsers and criminals and plus the attacks they have done on the border. The theological funding that they do is not as bad as the Wahabi funding, but the attacks they have done on Pakistan is a problem for us.