Anything UI is kinda bullshit because HTML and CSS were never designed to produce pixel-perfect fidelity on every screen but companies insist, and also jank like text mixing just slightly when you hover your mouse over it is bad UX. So what we wind up with is a fifty-level hierarchy of containers making sure everything lined up just so. That complexity is imposed by the intersection of HTML, CSS, and JS. Not that the previous developer wasn’t an idiot, but I freaking hate front end work despite being “full-stack.”