It's not that hard to use an external card reader. If needing to have an external card reader is enough to prevent you from buying one, you probably don't need to buy one anyway.
[doublepost=1531730383][/doublepost]
Uh, I'll let someone else cite things like Geekbench scores, but I do believe the answer to that is a resounding, "Hell Yeah!"
If your frame of reference for performance right now is a 2011 MBA and a 2006 iMac, anything that's a MacBook and up is going to run rings around your old machines. Even the current MBA, as outdated as it is, will probably smoke your old hardware.
As for the keyboard, they're very tricky to evaluate in store. They're so vastly different from anything else that came before it that you really don't know if you'll like them until you've used them for a month because you need to adapt to them first. I'm a mechanical keyboard enthusiast and I detested the butterfly switches, but the more I used them, the less I hated them. I actually quite like them now. They're still not my favorite switch, but I like it more than a lot of other laptop keyboards.
Failing that, you can always just get an external keyboard. In fact, that might be a good idea regardless purely for reasons of better ergonomics when you're at a desk.