I appreciate the /mobile style on tumblr pages. Tumblr styles are often unreadable for me.

I am indifferent to format=light in most cases. I find it helpful to see journals in their own styles as a memory aid, but like the default readability. I don't mind needing to use style=mine, but prefer format=light for reading other people's work.

I don't have much difficulty just changing the urls myself, though.