And especially that there are always two of them Rex . . .!!
Don't know about the sorts of mags on contemporary light aircraft, but things like the BTH 4 cyl jobs on Gypsy Majors (Tiger Moths etc) or 6 cyl variants in Gypsy Sixes are not actually that far removed from their car equivalents. Screened HT bits, yup, and with proper bearings not bushes on the distributor shafts on some, and modest improvements at the contact breaker . . . but overall not so different. Same rotating coil guts as on the cars . . .
A bit higher up the scale, powerful aircraft from the 1920s used screened 'AC' and 'SC' versions of the BTH 'CE' inductor car magneto favoured by the likes of Lagonda and Alvis (truly beautiful instruments for beautiful cars), with 14 cylinder versions on eg the Tiger VIII Armstrong Siddeley (which was the first Brit-built two-stage supercharged engine). All wonderful stuff . . . but OTT for us natch, and I agree with TT, a K2F at 10,000 feet - no thanks!