Soft disagree. I use the Qi charger to charge my phone overnight or while it’s sitting on my desk. The USB cable is when I need it charged quickly.
This way, my phone’s charging port is protected with a plug when I’m not using it and it is immaculate and unlikely to fail while I have it.
(My previous phone’s charging port almost failed and would stop working if I used it for all charging. Using Qi for the bulk of the charging kept the port working for when I needed it, like in the car or to the computer.)
I do the same, including plugging the usb-c port. I specifically got a 5-watt qi charger over the 10 or 15 watt ones so that my phone would slow charge overnight. The phone doesn't get warm when charging that way, unlike when I use the usb-c port.
Second this. When I sit at my desk, the phone's on the Qi pad. I don't need it all the time, and it's fine to stay there 30 min. When I sleep, same thing. I actually use a smaller charger brick so it charges more slowly overnight. I don't know what it's a better charge for the battery if it stays lower temp but it feels right.
I bought a phone mount one, it charges quite fast and it is so much easier to place my phone in the dock and have it charge. It does get quite warm but that's easily remedied by pointing an AC vent to the back of the phone.
Honestly it sounds like you got a low wattage one and yes those do charge much slower.