We must use our devices pretty differently then. I'm approaching it from a productivity device(for me primarily to use Logic Pro). To me key commands and mouse become essential for using any of my creative apps. The touch screen limits the size of touch targets, and any "pro" level app needs lots of hamburger buttons, sliding toolbars and excessive movements to do the same thing on an iPad, which to me slows me down and limits what I can do. I tried going iPad only, and it was neat... but I switched to using an old less powerful Mac... but the interface was just so much better to me. I picked up an Air and never looked back. I'm too much of a user of a ton of different of apps at the same time, scrunched into small windows in corners to use the two apps side by side approach.
To me the downside of using the iPad was always needing a stand to do anything productive on it... if you have to prop it up anyways and are going to use it that way 90% of the time... it might as well be a laptop that is just easier to close and open and use right away.
My main point is that a Mac makes a surprisingly good iPad, lightweight media consumption casual use, on top of being better at conventional computer uses. It was even better when I used the 11" MBA, hopefully Apple can release 12" MacBook size again to bring it even close in size/weight to an iPad.
I get those who just want a more iOS like experience, but for me and my tech-addled experience it's laptops all the way.