Nobody's attention span is infinite. I don't doubt I could understand all details of the EU legislative process and keep track of what sort of terrible proposals are underway if I put in the time, but I have a day job, hobbies that are frankly more interesting, and enough national legislation to keep track of.
If you then also say that the outcome is still my responsibility as a voter, then it seems like the logical solution is that I should vote for whatever leave/obstruct-the-EU option is on the menu. I don't understand why I am obliged to surrender either a large and ever-growing slice of my attention or my one-over-400something-million share of sovereignty.