An accelerator doesn't make tons of sense in a gaming context. Unless you're playing Akalabeth and you want to speed up the maddeningly slow drawing. :-) Jorma makes an interesting point in his article that you can actually use it to slow a game down that is moving too fast for you (though that would also slow down the controls, which might be just as maddening). Otherwise, for any other compute-intensive operation under the sun - it makes tons of sense. I/O on the Apple II is famously tied to 1MHz CPU speed, but any other task benefits: word processing, database, whatever. Even disk transfers are zippier because data still has to move around internally... it'll be 1MHz coming off the floppy and out the serial port, but it'll be 16MHz for any other thing going on (compression/decompression, screen updates, ...).
BITD, folks used AppleWorks to get real work done on an Apple II. It drove tons of sales of memory expansion cards and accelerators because it gave you more room to do your work and made that work go faster.
Plus, the dial is so cool.
Edited by david__schmidt, Tue Jul 18, 2017 9:37 AM.