I will absolutely NEVER understand this. Apple still makes Macs for a reason! If that's what you want... get a Mac!
iPads are for touch-based (and now drawing based) interactions. Many people can be very PROductive PROfessionals using a touch-based system.
Because I do not want to carry a laptop around with me, especially on the road. When I commute on the Long Island Rail Road (50 minutes each way everyday) I would not only have to carry my laptop but I would have to tether from my phone. When I can now VPN into my office network off of my cellular ipad pro 12.9, and RDP to my desktop or my many servers and manage them. If I had a mouse, or a touchpad, it would make it MUCH easier. Right now I use Microsoft's RDP app, and move the mouse using my finger on the screen...
If you do not see a need, that's great, you don't have to use it, but there are plenty of professionals who are working in IT, that would love to have a touchpad on their ipads. Why should we buy two devices, when one could easily do everything.
What I don't understand is how people like you feel, if you do not need it, it is pointless. And others, will act the same way, until Apple does the exact thing some people ask for, then act like it is the best thing since sliced bread. I laugh back at how so many in this forum said a stylus would be the stupidest thing to add to an ipad, well, I think we have learned that there is a serious demand for one. I have a pencil (had it since day one) and haven't used it to draw, I use it as a stylus was designed, to navigate, to take notes.
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Run a traditional desktop program and attempt to use.
You will gnaw off your own fingers in the process.
I not only use traditional desktop programs on my iPP 12.9, but manage servers, telnet into AIX boxes, and many other tasks designed for desktops. I do not want to gnaw off my fingers, I do however think my experience would be even better if I could couple it with a mouse/touchpad.