A two part reply.
Firstly, why replace the BMW beancan? There are 2 major reasons for doing this, firstly to get rid of the mechanical advance and retard, and secondly because they are old
The last time I set out to rebuild a beancan I found the bushes were all worn, the ADV/RTD springs were slack and the posts they mounted to were worn. All perfectly repairable and done properly the rebuilt beancan will outlast all of us.
But, I get more pleasure riding my bike than I do merely working on them so it was a no-brainer to update.
Like others I still carry a carefully hoarded "points in a can" beancan in case I need a "get me home". But I may stop that now and simply carry a spare hall effect as I reckon I could change that in under 30 minutes. In fact I might even pre-fit one and that way all I would need to do is flip the switch on the Wedgetail ICU..