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There are CPU monitoring addons for WoW that you can use to figure out exactly which addon is misbehaving, weakauras itself should also have a profiler somewhere. The 5600X is good enough to maintain at least 60 FPS on all fights in the game, though you don't mention View Distance - WoW has something ♥♥♥♥♥ going on there, so dropping it will help you a lot outside of Raids (or maybe in raids, I haven't touched this expansion, but usually raids are very contained and don't exactly have anything that would be rendered by view distance anyway).
Anyway, for you to have CPU FPS issues on a 5600X, old as it may be, it means 100% a bad addon. Weakauras are generally made by people who are not even coders, so they tend to take a brute force approach to solving the issues. Plater profiles, specially the youtuber ones, are usually made in about the same way - someone who is not tech-savvy who's just trying to get things done, and they don't really care if the game drops to 10 FPS, because they play as work instead of for fun, so they wouldn't mind even if the game was ASCII, so long as it gave them an edge.
You say addons are "non negotiable", but there are usually alternatives that do the job in a way more optimized way. KuiNameplates does a lot of Plater does, sans easy configuration, with essentially zero performance impact. Most of what you get through WeakAuras will have a standalone addon that's also more performant. Both Plater and WeakAuras suffer from making addon-making too easy and this results in people who should not be making addons making addons that perform badly.
WeakAuras can be well made and perform well, they just usually aren't, so it's best to simply not pick anything unless you absolutely can't afford not to, and if you're going to pick something, picking the version that does the one thing you need and nothing else tends to be better.