Totally get where you're coming from. I was in the same boat — once I started using CarPlay regularly, I found myself barely touching the built-in nav or connected services.
Unless there's a specific feature you really need from the renewal (like live traffic or remote services), it feels kind of hard to justify the extra cost, especially when CarPlay does most of it better and for free.
That said, if you're planning to keep the car long-term and want everything to work as intended for resale, it might be worth considering. But for everyday use? CarPlay covers 90% of what I need.