I think it would be great if they added a second USB-C port on the iPad Pro, although, that has been addressed with the Magic Keyboard.Limitation only to those that want the iPad to be (or truly replace) a laptop, really.
Which I can agree; it IS what I want. But that's because of ME, and my desire for the perfect 2-in-1 from Apple.
I feel we're 99% there: proper output to monitors and I'm good. Oh, and perhaps an even bigger iPad, like a 15".
USB-C, external drive and mouse/trackpad support were the biggest deal breakers for me and have now been addressed.