I never thought of potential _new_ players reading these announcements ... so many features are changed in roguelikes so often, it must be hard to describe everytime to possible new players why the changes are good.
Anyway ... the temple level is the only static level. it's like the town level in Angband, but there are some NPCs in there which offer quests, esp. the priestess, who offers the main quest.
Before the patch, some players did not know what do to in this level -- they wanted to go down the dungeon and crawl. Some others liked the temple for the first few times, but would like to skip it in subsequent plays. Now they can -- it's a way to ignore the story.
Edit:
If I start the game, I know nothing about the temple level (not even that there is one
You know, because when the game asks you if you want to skip it, it also summarizes the goal of the game, in which the temple is mentioned. Some lines below, it explains as a hint what the temple is (that there are traders and NPCs).