It's been the Structure of TWIR Posts for as long as I recall, we'd need to ask Azzana (on Discord because he prefers it there) to separate them, and then hope his successor follows suit.
At least it makes sense to separate them when they're cosmetics like the ones we'll get, for other regular promotions, like the ones from previous weeks it's fine for them to stay in the news posts. They're like 12 Lines of text.
But on the other hand, there's people who are used to read about the latest and upcoming TH Promotions in the Weekly Posts and actively look forward for them.
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Idk, i didn't expected this topic to have these many facets ...
I read reddit as well don't worry.
TWIR is aimed to be a catch all of the things happening around when its posted, this can range from updates, patch notes, merch, events and Treasure Hunter Promos.
While I get the want to separate them out I could see it causing trouble (I don't imagine the people wanting to ignore promotions would appreciate more posts coming out that are exclusively for promotions)