Good question. I have an answer although I'll admit I can't say it's a good one.
On a 180 I had at my house, as an a example, I did water changes and didn't have a sump. The drain was far away and would have required major routing (over or under a floor) to get there from the tank. I had other tanks that were sometimes close to drains, but not close to a source for water, or vice versa. But most were near neither. At my apartment, I had a 75 and a 55 and neither was near anything that could have been used. They didn't need to be because I did manual water changes.
So my experience has been that the conditions were never good for the combination of having a nearby source of water and a drain.
Of course, had I planned differently, I might have had both, so my answer isn't very good. But my personal view tells me that most people that have smaller tanks (under 180 and definitely under 125) have them in locations where water changes can be very manual and therefore a drip isn't a good choice.
Totally anecdotal, I agree.
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