The rest of the team will end up having to go out of their way to accommodate you, your accomplishments won't be as visible, and you'll be passed over for performance-based compensation and/or promotion.

Though I guess that's fine if it's a job you plan to take for a year or whatever and move on.

Keep in mind that it's usually a culture thing. Programmers working from home makes sense, sometimes the janitors, security, chefs, CS want to work from home too, which makes less sense. Whenever I've done crunch time on weekends, the managers or more senior ones are always there too, even when they're doing nothing, sometimes all the way up to the CEO. A lot of office cultures seem to encourage this form of suffering together. This is also more likely where the staff is mostly offline e.g. Tesla or Amazon.

So I see absolutely no reason to give up compensation for this - this might actually hurt your argument. One option is taking on a part time contract instead so they're not under the same benefits as the ones who are working from office.

Your friend needs to demonstrate that they are an exceptional hire, only then does negotiations about compensation and working arrangements come into play.