I think it should be employee based not company based. If you're in the office you don't have a real good reason to discriminate against someone working remotely. If you need the person you'll arrange a meeting or call them regardless, how does it work with clients? If they're working remote, do you just decline their business? If you're discriminating against a colleague on that basis, you're actively chosing to do so. If you're subconsciously doing it, you're probably doing it for other factors, which you should be consciously considering and mitigating.