It was only expressed as that because of the angle the mouse-evangelists take to try and make a case for mouse support as being needed for ‘pro use’. Pros are largely beyond the mouse for speed and efficiency.
I said it above, there are plenty of laptop PCs and Macs if you really want a mouse. Alternatively, there are Surface Gos etc on the market, priced similarly to the iPad - why ruin iOS optimisation for touch by making mouse support a serious element? It can’t exist in a vacuum.
Wholeheartedly agree that there are choices out there. As much as I like my iPP 12.9 I've come to grips with its limitations and am ready to move on to a Surface or Surface Pro X soon. I don't necessarily buy into the fear that iOS optimization is going to be negatively impacted by the implementation of mouse support. The user base that will use mice will be a minority for sure which will still mean developers will still lean towards touch optimized interfaces that the iPad is intended for. But we can agree to disagree here, it is possible that devs will consider interface changes.