"Buy what you like" is a fine motto. But I think locks are worth thinking long and hard about -- although not to the exclusion of other components of the knife. If you believe, like I do, that at least one popular lock format is unsuitable for hard-use folders, absolutely you should rule out any knife with that lock format if you're looking for a hard-use folder. If you believe all the popular lock formats are close in their capabilities, then "buy what you like" without worrying too much about lock format is perfectly sound. I do think that a whole lot of folks see major differences between the lock formats, hence the perfectly reasonable attention on locks. As customers have become more knowledgeable about steels, you see tons of posts focussing on steels as well -- which is good, if you believe, like I do, that the steels have significant performance differences that separate them.
Buy what you like, but also buy what you feel is appropriate for the job. Buying strictly on whimsy will end you up with a bunch of knives that don't quite perform the way you want.
In my case, the knife has to meet my lock format requirements. Once it meets those requirements, it has to meet all my other requirements as well, regarding aesthetics, ergonomics, fit and finish, steel selection and heat treat, etc.
Joe