I have a similar pipeline set up at work -- it's surprisingly valuable.
CSS is rife with potential to cause faraway effects. Catching these regressions is very satisfying.
It's also useful to get a survey of all of your UX. Being able to see everything at once has helped us to improve the dark corners of our app/site and see patterns where we can extract into a design system
Running mobile width screenshots has been awesome. Designing/developing for mobile first doesn't always happen and this surfaces areas that need responsive work pretty effectively.