To some extend, that's true. Most things I do that aren't development related are done on a web browser. It's absolutely perfect for that. Starts up extremely quickly, very light, long battery, lovely.
For very occasional dev purposes, I simply used crouton, which works insanely well. I can even use sshfs and go back to ChromeOS and have the drive still mounted. Highly recommend the c720, or whatever is the more recent equivalent.
Now mainline Linux kernel support is so good to the point that you don't need to hack on it to get it to work.
How's the screen like? Do you see pixels when reading text/code? If my calculations are correct, the Dell Chromebook has 169PPI, while the MBP 13 has a 227 PPI display.
About DPI I would love to have the MBP screen, so I can do the 2x DPI mode, however, ~1.5x scaling for 1920x1080 is not bad at all. KDE scales odd DPIs really well, so I don't have a problem with it generally speaking. After you set the DPI on Control Panel/System settings, everything scales seamlessly. I have yet to find something that makes me frustrated in terms of app scaling.
Without the display... which is a major reason why people purchase a Macbook Pro.
After you install John Lewis' ROM (basically a Coreboot build), it is an absolute dream, and everything worked out of the box, wifi, bt, 3d acceleration, suspend/resume, audio jack detection, you name it. Trackpad is really smooth, 1080p resolution IPS, the battery lasts 10 hours, never gets hot, fancy back-lit keyboard, has 8 philips screws in total to take it apart. Hell, it even has a TPM module so I can do those fancy ssh password-less logins (https://github.com/ThomasHabets/simple-tpm-pk11). If you really like the clit mouse, then this machine wouldn't cut it though. The speaker is kinda iffy and doesnt sound very nice, but nowhere bad.
It is also only 500USD, so that's another factor.
Pic: http://imgur.com/FRynGSw