Cost, knowledge deficit of the designer &/or eng side, inertia.. there are a lot of reasons. Many html a11y features are as easy to implement as adding an attribute (but people are unaware) -- other things, like designing a product flow to be accessible, can't be fixed with engineering; they have to be redesigned.
My team at LinkedIn is trying to solve the eng side of this with a combination of automated tooling like linting & headless testing, reporting, etc., trying to make it as painless as possible for an engineer to fall into a pit of success re: a11y for web/mobile experiences.
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Cost, knowledge deficit of the designer &/or eng side, inertia.. there are a lot of reasons. Many html a11y features are as easy to implement as adding an attribute (but people are unaware) -- other things, like designing a product flow to be accessible, can't be fixed with engineering; they have to be redesigned.
My team at LinkedIn is trying to solve the eng side of this with a combination of automated tooling like linting & headless testing, reporting, etc., trying to make it as painless as possible for an engineer to fall into a pit of success re: a11y for web/mobile experiences.