It's a great idea to be proactive in this area, but always make it easy for your users to report problems. People with different conditions, whether classified as disabilities or not, have varying capabilities. You might be surprised by the issues people encounter with your product, even if you follow all guidelines meaningfully (so not just with placeholders like alt="image" - yes, even then).

Source: I've been part of an accessibility taskforce at my company for a long time.