When my Boyer failed, it seemed to get "stuck" at advanced, there were terrible kickbacks. Nearly wrecked my foot, nevermind the crankcase.
This is just one unit in one bike. Doesn't actually mean anything, other than I would not fit a Boyer to my own Triumph if it had electric start.
Think I wouldn't keep a Rita, even though obviously durable if still going, just because of the (probably misplaced) idea things have improved in the last fifty years.
There is an electronic ignition with antikickback, supposedly. Can't remember which one.
There's other things to do to reduce kickback risk. Oil. Contentious, if course. I use 5W/50, makes starting easier. Use foot to get just past compression . Engine has easy starting then, momentum before hitting a compression. Get a Fulbatt battery, plenty of turning amps. Obviously keep bike maintained, valves, and battery. Perhaps set timing to 37⁰. Maybe avoid using if means leaving in very cold conditions? Could always warm a very cold engine at home. Might be better not to get the stronger mechanics? Better they go than the casings?
There's an electric start Tiger that went around the globe, it's not all doom and gloom.