The way I look at it is this - what ever it takes to make the shot I want or need, the quickest, with minimal cost, equipment and effort, preferably, because most of us can never afford to have the 'warehouse' of equipment that he has. Some successful full-fledged commercial photographers I know even survive with a lot less!
What I like about the Strobist movement is the very crux of it's existence and philosophy - to empower enthusiasts and hobbyists with skills and abilities with everyday equipment and produce stunning results! Now, the term 'everyday' is subjective, because most hobbyist or even enthusiasts would never own, yet alone by intimately familiar with lighting ratios, off-shoe work and remote triggers!
As humans, we tend to be lazy by nature, or the 'Maggie Mee' society we live in conditions us to be lazy, but that has an upside - innovativeness!
As the old saying goes - there's 101 ways to skin a dead cat.
If it can be done with one speedlight and a reflector and one trigger, it can definitely be done with 4 studio units, an equal amount of triggers, light modifiers and assistants. I'll choose the simpler and cheaper method anytime - IF it gives me the results I need with the speed or efficiency I need.
Bottom line for me?
Whatever it takes, preferably minimally.
One light or a hundred. Some things can be simplified, and some, because of the very technical nature or conditions, requires a lot more work, or (horrors!), equipment.