https://www.curseforge.com/wow/addons/tidy-plates-threat-plates/issues/372

Optional setting for nameplates to temporarily hide all nameplates of infight mobs that are not casting while at least one of the infight mobs is casting an interruptible spell. Would be very useful for mouseover-interrupt-macros when pulling large groups of mobs

This setting should be optional and 'off' by default
Hide other npc nameplates only when cast is shorter than 'x' seconds. I got the basic idea from this weak aura (that does not work with any nameplate addon): https://wago.io/HD5kmQuR3

I bet this could be very useful for many players to do their interrupts correct