Brilliant people don't need to be brilliant in everything. You can use lesser tools and still accomplish a lot.

Or maybe they're not lesser tools.

Yes, but the set of brilliant people is larger than the set of brilliant people using the best tool in each area. We don't live in a perfect world, and brilliant people make trade-offs. Unless you know what kind of trade-offs they made, you can't generalize their choices. For instance, when Peter Norvig switched from Lisp to Python for his classes, many people argued that Python was an "acceptable Lisp". When asked about his decision, Norvig answered that Python was a better choice for his teaching goals, and nothing else.

Also, let's not confuse techniques with tools. It is unfortunate that, other than modal editing which is too generic, we don't have a name for Vi-style editing which does not involve Vi, so people confuse Vi-style editing (e.g. the technique), with Vi (e.g. the tool). The tool may have its own shortcomings which render it unsuitable.