Many (probably most) people in most jobs do perfectly fine working from home.
But I've seen several cases where others take advantage and then cry wolf about how they're "overwhelmed" when they do make it into the office. I'm sure it's just a coincidence that the people who worked from home 3x a week (with basically no oversight, as my manager was a doofus) were always "too swamped" to back anyone up or take on some extra work at busy times.
In an ideal world, the manager would notice this and pull their work from home privileges, but that would almost certainly become an HR nightmare,so it's just allowed to go on.
At my old gig, we had a person who pulled this move for like 2 years. And every time she did come into the office, the windows "boot up noise" from her computer would be so loud you could hear it from the parking lot. My theory, she turned it up so she could hear the computer beep from the other room (whenever she got an email or IM) and then just spent her WHF days on the living room couch watching soap operas.
But yeah, for most people, it's a great convenience and an asset to the company if they're responsible enough to handle it.