If you have concerns about UX I'd have thought you should be commenting at the design level rather than leaving it until things have got to the stage where they've been developed to the point where there's HTML to talk about.
In my experience, this doesn’t work. It’s always in everyone’s “In a perfect world” plans, but no one ever seems to have much to say, in the beginning. Even technically-proficient major stakeholders (for example, managers and testers) seldom offer much in the way of feedback, early in the project. I have learned to write my applications in a manner that affords “hands-on” testing, as early as possible, and I use tech…
I think we agree in principle. I prefer using design tools that offer 'interactive' previews like Figma, but the idea is the same - get feedback from stakeholders as early as possible.