Good points and I agree.
On the other hand someone only doing this once can do so and only buy a tap. They don't need to waste money on a reamer for one job, also taper pipe reamers are harder to find locally than the tap.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-