Q1. A few years ago, steam allowed you to sort tag-based releases (e.g. MMORPG) by release date.

But recently they moved to different model. Consider the MMORPG page:

https://store.steampowered.com/tags/en/MMORPG/

Now you only have "New & Trending" which does not sort by date:

Q2. Any given steam store page has an option called "View update history":

This data is also provided in your library in the top "What's New" banner:

But this is only for games that you own.

Is there a way to "subscribe" to the update feeds of a set of games; doesn't have to be through steam. An external tools/website would work too.

Cheers!