@weinoo thank you for linking to this older sourdough topic. When I thought about trying to make sourdough bread I found the eGullet sourdough bread course but I did not find the content you just linked too. Happily going down that rabbit hole of a topic!
The Cooks Illustrated author, Andrew Janjigian, wrote about moving from an equal parts refreshments to another ratio (1 part starter:2 parts flour:2 parts water) once your starter was active on his quarantiny starter blog. Sadly the content on his blog and in his instagram posts was pulled (suspect he is dealing with some legal issues with CI). Very interesting to read about the eGullet recommended refreshment ratios from the 2009 topic that you linked to.
In case anyone else would like to access go down a rabbit hole the eGullet courses (they can be difficult to find). Here are a few links:
