Yes, it may even be too overwhelming :) If so, those feeds are what I use as my main sources for writing iOS Dev Weekly, here: https://iosdevweekly.com/ which will give you a slightly cut down list of the best of the week in iOS development.
Also, for an improved experience when importing an OPML, please consider nesting all outline elements inside another outline element that is treated as a folder when importing. I imported an OPML to Feedly, and have to manually move them individually into a “iOS Developer Blogs” folder.