Serious dev work is not done mostly on a small screen. Your laptop is a moveable computer that will be connected to your workstation monitor. I own a 14 inch macbook and rarely use it without a display.

Why drag around a laptop, if you have monitors everywhere anyway, and I assume you could easily add a full PC too?

Because I am disallowed from accessing company tools and network with my personal devices. This is exceptionally common and has been the policy at every company I ever worked for.

In my case I sometimes work from home and sometimes from the office. The laptop is handy since I can bring it with me and use the same computer at both workstations, both of which have external monitors.

I had a NUC that was even better for this, it fit in a pair of cargo shorts.

Laptop is nicer for coffee shops, though. Lots of things are aided by an external monitor, but not everything requires one.

If you use it hitched to a monitor, then why not have a proper workstation?

The whole point of having a laptop is being able to use it on the go.

I travel by train and plane extensively and I write code on it during the trips.

14 inches is unusable.

I think it depends on your eyesight and programs. I have a 13.3″ laptop, but I just use vim and a pretty small font. My favorite laptop ever was the Toshiba NB305. At 10.3″ it was a "one app full screen at a time" machine, but that was appropriate for the processing power anyway.

Very narrow minded attitude. Might be unusable for you but great for others. Try to keep the tone a bit more friendly.