I haven't got "1,000's of cars I've worked on" and would certainly never claim to "usually get 90,000 miles" from my pads, but on a realistic note my 2 opinions to this are:
1) It's a pointless concern. (AS FAR AS ECO GOES!) If your brakes are dragging enough to cause depreciation in your economy then parts need replacing. Case in point: I've actually had a drum I couldn't take off without cutting because my adjuster had not been replaced by previous owner and it had rusted into place. It didn't stop that wheel at all, but there was still a lip cut into it that caused problems.
2) The handbrake reasoning is sound but noone's mentioned that drum setups are cheaper for manufacturers, it was mentioned that they do bring in more return business tho.
I have found in the last few years that drum setups still prove to be easier to both diagnose and replace.
I wouldn't worry about it. The only way to improve the adjuster would be to custom build one with smaller teeth.
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