[nbouscal]

Judging from his discussion of cib in the Data Acquisition section, it seems like he's familiar with it.

[falcolas]

Perhaps familiar, but not ingrained in his muscle memory to used instead of d<motion>i.

[nbouscal]

To be fair, I'll often do that as well, but just looking at the keys misses that there's a pause between the d<motion> and the i. I don't like sitting in insert mode, so if I don't know what I'm going to replace a thing with, I'd rather delete it, then insert something else after I've figured it out.