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Good you mention application and ARIA ... I've just come out of a project where the initial brief completely disregarded anything in terms of accessibility. Full on angular app, no native forms or form elements (because they "look ugly" apparently). Then the ultimate end client wants to go live but forgot to mention they had a mandatory accessibility audit. So I've spent quite a bit of time working out how to make th…
Out of interest, did you do any user testing for this site? I've worked on sites that have required a legal accessibility audit and in my experience a lot of screen readers don't even know what ARIA is, let alone use it. Like users that stick with older browsers a number of users use old screen reading tools.
I also have the impression that there are quite a few people with older browsers out there because of the screen reader setup, and I don't think that's a good thing, but maybe it's a matter of doing what we're doing to older browsers in general: phase out support.