The question I feel we should be asking ourselves is rather "what is the purpose of still tracking individual xp?"
Just move over to milestone levelling (or in my case, the group levels every three sessions on average as I see fit).
It's so much easier and cleaner and faster.
XP is an illusion in 5th edition. Its purpose is to give off the illusion that progress is objective and scientific and keyed to events in the game, while controlling the rate of levelling to match the adventures played.
...but you can accomplish that easily without XP, so what's the point? (Just award quest XP)
...and as a throttle on the levelling, well, you will still level at the pace that suits the adventures the DM has prepared for you - neither faster nor slower - so why keep up the pretense that this isn't the case.
In older editions, XP was necessary because different classes levelled at different speeds. Or XP was used to pay for magic item crafting.
In 5E there simply is no need to keep using XP just to go through the motions. And I for one is glad the official modules don't even try to keep up the pretense.
Whether monster XP is 46% or 100% of what's "necessary" is a huge non-issue to me, and I sincerely hope you can take this post to truly examine your own stance on XP, and hopefully come to the realization that this whole "the modules are somehow bad because they don't care about making the XP totals match up" is not where you, IMHO, should direct your energies.
Sincerely and respectfully,
CapnZapp