What happened to beehive springs?

No, electronic ignition actually has merit. Beehive sprAngs won't do anything a good properly chosen conventional sprang won't do. It's still a valve sprAng.

Its a sprAng that doesn't carry 50ish grams of useless spring/retainer weight. Thats huge in terms of gaining valve train stability.The OEMs have all gone to beehive springs and 8mm/5/16" stem valves for that vary reason. Its progress not a fad. I grant that if the valvetrain isn't having stability issues they probably won't do anything for you.