Just think about it.
Whatever everyone says, most of the work, most of the actual get-your-hands-dirty work, is on designers and developers. Once they get it right, everyone's job is much easier. I'm not saying the work is done once the developer submits the last PR. I'm saying the person reviewing that PR will have an easier time doing it and there will be less of a chance that PR gets rejected.
How designers and developers get it right though, that comes down to education. And it comes down to organisational culture. Culture means that your organisation prioritises accessibility from the ground up. They invest in regular training sessions and set clear accessibility standards in project requirements. They create an environment where everyone feels empowered. It means leadership demonstrates a genuine commitment to accessibility.
I've been thinking about this. Just because I know accessibility is important. And just because I can review wireframes and design prototypes. And just because I can review PRs and test with a screen reader. It doesn't mean I'm doing the work. The actual get-your-hands-dirty work.
The real work happens day to day, when developers consider semantic HTML and designers colour contrast and interactive states. And where both groups collaborate.
The real work happens in the text editors and design tools.