I rented an EOS R (didn't check the shutter count) and shot some events nearly as important as a wedding with no issues. The benefits and experience with it made me forget about the card failure cloud over my head.
I know SD tech has improved over the years, but what about the 5Dc and 5D2? I'm sure the industry certainly used those and I'm curious what the card failure rate was, albeit CF cards.
I do fall into the 'better to have it and not need it, rather than need it and not have it' camp especially since we've had that taste on the 5D3 and 5D4 dual card slot security blanket.
Anxiously awaiting for other R versions!