Is that what it really does or what you think it does? Because in games where this has been a thing, we just keep resting until we don't have an interruption. So in my experience it's a minor annoyance and some bookkeeping and doesn't add much. Getting players to really think about whether it's worth taking a long rest is a matter of time pressure, something I think is underutilized by most DMs. Interruptions on rest isn't as a good a tool for achieving this goal in my view. Taken together, it can really be seen as a screw job.