That is an excellent point. Ports are always vulnerable.
On the other hand, it seems that wireless charging is also the reason why many modern phones have these stupidly fragile glass backs. So your whole phone gets more vulnerable.
I don't buy it. Pixel 5 did have a kinda metallic-plastiky back (sort of plastic around wireless c, but it was impossible to spot the area with naked eye), it looked nice. You also can see the zenfone 10, it's some sort of plastic, but super nice to the touch. Having glass back is not mandatory for a wireless charging phone, I think companies do this to make more profit on repairs longterm
On the other hand, it seems that wireless charging is also the reason why many modern phones have these stupidly fragile glass backs. So your whole phone gets more vulnerable.