2x Mosaic for “100% chance to not consume and refresh all timers” will lock you in to an element and it wont expire until you stop attacking for 15 seconds. So if switching elements with PS is preferred, you might want to stick to plague.
There’s a really good post in general forums about how NHD will affect the lightning skills with mosaic:
The videos are great demonstrations of all the interactions. TLDR; it’s not a massive conflict, they don’t overlap as much as you would expect. But kicking at 3 frames per kick, with a 4 frame NHD, does mean that it skips dmg to the main pack with every other kick for some skills. Those lightning storms and charged bolts can still go out and hit other monsters though, so it’s not a total waste.
On the flip side of that coin; skills without next hit delay, like the Phoenix Strikes meteor, can be used at 6+ attacks per second. So you could technically drop ~6.25+ meteors per second with dragon talon.
One thing that I think might be kind of fun; now that traps and martial arts +/- elemental skill damage is fixed, you can lockdown into one element and compliment it with a maxed out trap:
Claws of Thunder + Lightning Phoenix Strike + Light Sentry
Meteor Phoenix Strike + Wake of Fire/Inferno
https://maxroll.gg/d2/d2planner/en0206vn