It's just hard for some of us to imagine a ham station without a CW key.
I have a key but it is not connected.
OK, now I see how things work with some newer radios:
1: If keyer paddles are plugged in to the radio, the radio only works in keyer mode.
2: If keyer paddles plugged in, there is no straight key input to the radio
In above setup, yeah, there's probably no way for someone to have a straight key connected at the same time as paddles, and the futzing around with plugs and cables would be quite a hassle.
I still use an external keyer, and I keep my J-38 on the desk too, hooked in parallel, and switch between paddles and straight key (and the use of J-38's shorting bar) without even thinking about it. And my computer is hooked to the keyer too, so right in the middle of a contest I can go from having the computer key to having me key with iambic paddles to the straight key without even thinking about it - something I actually do pretty often.
This config while perfectly straightforward to me... may not be how many hams are set up anymore.