Bolt needed massive preparation time for which he needed Mitsuki as diversion for his lv.2 Gale Palm, and he required all 4 clones to use, so he isn't using it in a 1v1.
OT: from what I've seen, Boruto's reaction speed is severely decreased when he's using Gale Palm, and he actually can't dodge any attacks. It's either he gets the hit in or he's knocked back, in which case it can be pretty bad when he's moving at high levels of speed.
Shizuma didn't have Sharingan, so we don't know whether Sarada with Sharingan wouldn't be able to react to it, and Sarada struggling against Buntan in CQC who was wielding a sword is a bad example.
It's not the same as Boruto coming from a distance and traveling in a linear speed, even. He also has to weave the hand seals first, and that gives Sarada time to brace herself, so she's not getting entirely surprised either. That said, I frankly don't understand why she can't react to it, especially since she de-activated her Sharingan amidst their scuffle at the Hokage monuments, almost as if she didn't need it. What I got from that was Base Sarada can actually keep up with Base Boruto. Then with Gale Palm, she would need the Sharingan.