alt Hacker News> "date the body, marry the glass"
how is that different? They both mean that you won't be keeping the camera while holding onto the lenses. Also, at the time of the saying, it was for professional film shoots and not your take on vacay. Yes, it's an old saying, but rang true for a long time. Similar to Moore's law. Neither are as relevant while still being a bit truthy.
You don't rent the camera body any more than you rent the lens. If you are a hobbiest or doing a job that doesn't require a huge range of gear you should own both.
The saying is more that camera bodies get updated far more often than glass so you should care more about having great glass and swap out the camera bodies as needed. But owning lenses but no camera body would be absurd.