Yeah of course I was talking about Pulse Weapons, sorry if I didn't specify.
Don't even think bodies are marked as "X" on BGwiki, their drop rate should be "V" I think, so yeah, like 3-5% approx, I think?

And as for Mythics, they are "in theory" fixing Mythics with neosalvo.
Their plan was to make so getting lv99 of Relic, Mythics and Empys would be the same level of difficulty.
Atm Relics and Empys are very close to each other (with Relics being a bit easier imho) while Mythics are completely off scale.
If they succeed (but will they?) in rebalancing mythics as well then... uhm... then things would be "balanced" for the time being, but in the long run Empys would still get fucked by the lack of HMPs/Riftstuff on the market.

But yeah, you're right, it's very much likely they just won't give a fuck about it and refuse to fix it just like they did for many other things over time.