[PeterisP]

A big difference is that most of enterprise software is designed for a limited set of internal users, not the general public. If you have a 1000 employees and one of them is blind, then the software used by the department where that person works needs to be accessible to blind people as a reasonable accommodation, but you don't need to make e.g. a random accounting tool used by five specific users accommodate something that none of those five people have. The same applies for physical work such as in a manufacturing environment - you may have to accommodate a particular workbench/tools so that they are usable from a wheelchair (e.g. lowering certain things) but you don't have to redesign all your workplaces for that, that would be bad as it would make them less usable for their current users.

Also, "accessibility" is not a single feature; different aspects of accessibility - for different needs - are quite different, unrelated, separate features.

[mwcampbell]

> you don't need to make e.g. a random accounting tool used by five specific users accommodate something that none of those five people have

What if that team then wants to hire a sixth person, and one of the qualified candidates is blind (or has some other disability that's relevant for software)? If accessibility isn't the default, it's too easy to pass on qualified candidates in a category where many struggle to find work.