Alright then, the massive disjoint is frame 30 with about 20 frames of lag. Also, it's frame 30. The only use it has against someone who is used to playing against zss is catching them on hard reads of tech chases. You shouldn't shield it, you should just jump over it and punish. Doesn't guarantee follow ups either because it's really easy to crouch cancel (or asdi).
As for her throws, they are all SUPER easy to DI. The correct DI for literally every throw is the same at all %s. If you get grabbed, you know what to do. The angle on her upthrow is fine, the problem is that it has ungodly amounts of lag. Characters like yoshi can literally DI in and hit you before you are out of lag. It never has chaingrabs unless they are high% spacies with no/bad di. Also, if she upthrows onto a platform and you aren't a fast faller, standing tech because she can't get out of lag in time to punish it. Her forward and back throw have alright angles to send off stage, but they have very little knock back growth meaning you never really send them too far away. Ftilting them off stage sends them farther from like 60% on. Dthrow sets up tech chases at low %s or against fast fallers and that's it. You get follow ups with bad DI, but you really have no excuse to DI badly against ZSS throws unless you've never played the matchup.
Fox has a much much better projectile and insanely safe approaches. ZSS's best approach option atm is a -3 upair or rar bair. Also, fox has much better DD punishes like upsmash, upthrow upair, or even dash attack to upsmash.
Falcon also has an insanely good nairplane, and a +1 on shield aerial with a punish game that uses insanely quick moves. If zss grabs you, she will throw you into a slightly disadvantageous place or get a tech chase. If falcon grabs you, you are either getting knee'd or combo'd and then maybe knee'd.
Basically, ZSS dash dance isn't bad. But it's not nearly as threatening as other DD based characters. I think her neutral is fine, but it's not spectacular. I don't get how anyone can say lucario has a bad neutral and then say zss neutral is good.