Even if it is half an hour, that's half an hour of /no functionality/ - whether that is acceptable to you is a personal decision, but to claim it's not a functional problem is a lie.

My Sony wireless headphones have a similar issue. They cannot be used (with Bluetooth / ANC) when charging. My ReDragon USB mouse does not have that issue - it has a standard USB-C port on the front edge and I only need to charge it every few weeks, which is far less often than I charge a phone, so insertion cycles is not a concern.

I had some Skullcandy bluetooth headphones I liked, and when the foam started to go, I bought the new model of the same product. The new ones instantly disconnect when charging, so you can't listen with them wired to a charger/power bank. Why???