How much accessibility is too much (power features, keyboards)?

I work on a team that has been building out a design system for a proprietary application. We often have discussions around the best way to build new functionality. Recently, one conversation was about Drag & Drop, Bulk Select/Actions, and what degree of accessibility would be appropriate for this functionality, such as screen readers and keyboards.

Generally speaking I'm an advocate for building out accessibility, especially when it involves access to information. However how far is too far, or is there really no limit?

To a degree I understand that it will differ from application to application, but is there a standard for "good" accessibility in regards to power features like bulk select and bulk actions, where the availability of key actions and information is not hindered? How would one know when the conversation is beyond useful for the product?