Much like drones are much better at most outdoor operations, wheeled robots are much better at most indoor operations. Yes, stairs, etc etc... but if a company has a big enough need for investing in robotics, it's likely they will be willing to invest in the infrastructure (ramps, etc) to support those robots.
Also, consider for a moment the following from Boston Dynamics:
> Spot should always be operated at least two meters away from people
That alone eliminates something like 95% of workplaces.