I dont think its related to ping, or im extremely lucky as Ive had 80 - 120 ping the whole time ive played DF and never experienced it.
You should have shown ray/parry or just spamming weapon swaps to show how fast it is with low ping. They need to increase add a toggle to be able queue weapon swaps and then change the weapon swap timer to the original dfo delay. Its actually stupid how fast you can ray/parry or transition on someone, theres almost no counterplay to it and it removed a lot of the skill of transitioning and ranged play.