My problem with Little Snitch is that it throws too much information at me, or it's better to say that I care too much for the information that it provides (and it provides a lot of information). What I would like to see is exactly what you said, a preset that would disable everything besides browser and what I initiate.

Edit: Ok so I installed Beta, and it asks you on initial setup page if you want to enable or disable all iCloud and macOS services (respectively, they are completely separated options). That's cool!