I note that what you write here is true in the technical sense of the word. The HC still change from Pike to Sword and vice-versa, but that isn't what is being protested. It appears that they no longer change from Cav to Phracts, and from Pults to Ballista to Ram.
Yesterday, someone noticed it early and asked everyone else to scout to see if it was just an anomaly if there was a consistent pattern. I've just reconfirmed today with the remaining 16s on my server: All HC 16 have Phracts and Pults as a consistent feature, and only vary for Pike and Sword.
Also, your participation and words in this thread are highly appreciated.

