I love the fact that my lace-up Zadig & Voltaire boots have a zip on the inside!! Though I kind of know what you mean - it's superfluous & unnecessary.
When I was a student/in early employment, & Red or Dead had a shop in Glasgow, I bought the most fabulous pair of lace-up knee-high black leather boots in the sale. Properly stompy - but with no zip!!
I loved them so much - but whenever I wore them on nights out (when I'd inevitably get quite drunk) I just couldn't be arsed unlacing them when I got home, as it took so bloody long & I wasn't exactly fully functioning ... Several times I would wake up the next morning still wearing them, with a cracking hangover ... So eventually I got rid of them, which I really regret now!!