I find several sources claiming that power-of-two bits in a binary word (such as 8-bits per byte) is a "good thing" or "convenient". I find no source pointing out why.
From What is the history of why bytes are eight bits? we read in the approved answer:
Binary computers motivate designers to making sizes powers of two.
Ok, but why? In the same question but in the comment field for the question I find:
Is the last sentence in jest? A 12-bit byte would be inconvenient because it's not a power of 2. - robjb
Again, void of rationale...
address calculations are a heck of a lot simpler with powers of 2, and that counts when you're making logic out of raw transistors in little cans - Mike
As bytes are the smallest addressable unit, this does not make much sense. Lots of upvotes on the comment though. Maybe I missed something.
The de facto standard of eight bits is a convenient power of two permitting the values 0 through 255 for one byte
And this would be convenient because...?
For clarification, this is about the number of bits per byte (e.g. 8 or 6, etc), not the number of values per byte (e.g. 28 or 26, etc). Because of the confusion I also point out this is not about Word sizes.
I´m not overly interested in historical reasons. Those have been well explained elsewhere (see links).
Related question on SO: https://stackoverflow.com/questions/1606827/why-is-number-of-bits-always-a-power-of-two